Add theme preset UI and Docker compose

- /edit/theme-settings now lists user-defined presets with preview
  swatches, edit and delete actions
- Add/edit preset form at /edit/theme-settings/presets/new and /{key}
- Built-in catalog (14 themes from docs/themes.md) with one-click import
- docker-compose.yml using ghcr.io/uhlwoogi/modern-glance:latest
- Dockerfile gains OCI source label for GHCR repo linking

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/glance/admin-edit.go

@@ -1179,6 +1179,133 @@ func (a *application) handleAdminUpdateTheme(w http.ResponseWriter, r *http.Requ
 	http.Redirect(w, r, a.Config.Server.BaseURL+"/edit/theme-settings", http.StatusSeeOther)
 }
 
+// ---------- theme presets ----------
+
+func removeKeyFromMapping(m *yaml.Node, key string) {
+	for i := 0; i+1 < len(m.Content); i += 2 {
+		if m.Content[i].Value == key {
+			m.Content = append(m.Content[:i], m.Content[i+2:]...)
+			return
+		}
+	}
+}
+
+func (a *application) handleAdminCreateOrUpdatePreset(w http.ResponseWriter, r *http.Request) {
+	if !a.adminAccessAllowed(w, r) {
+		return
+	}
+	if err := r.ParseForm(); err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	key := r.PathValue("key")
+	if key == "" {
+		key = strings.TrimSpace(r.FormValue("name"))
+	}
+	if key == "" {
+		adminError(w, http.StatusBadRequest, "preset name is required")
+		return
+	}
+	for _, ch := range key {
+		if ch == ' ' || ch == '\t' || ch == '\n' || ch == ':' || ch == '{' || ch == '}' || ch == '[' || ch == ']' || ch == '|' || ch == '>' || ch == '&' || ch == '*' {
+			adminError(w, http.StatusBadRequest, "preset name must not contain spaces or special characters")
+			return
+		}
+	}
+
+	editor, err := loadConfigEditor(a.ConfigPath)
+	if err != nil {
+		adminError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	theme, err := findOrCreateKey(editor.topMapping(), "theme", true, yaml.MappingNode)
+	if err != nil {
+		adminError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	presets, err := findOrCreateKey(theme, "presets", true, yaml.MappingNode)
+	if err != nil {
+		adminError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	preset, err := findOrCreateKey(presets, key, true, yaml.MappingNode)
+	if err != nil {
+		adminError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+
+	fields := make(map[string]interface{})
+	for fkey := range themeColorKeys {
+		raw := strings.TrimSpace(r.FormValue(fkey))
+		if raw == "" {
+			fields[fkey] = nil
+			continue
+		}
+		h, s, l, err := hexToHSL(raw)
+		if err != nil {
+			adminError(w, http.StatusBadRequest, err.Error())
+			return
+		}
+		fields[fkey] = hslToYAMLString(h, s, l)
+	}
+	for fkey := range themeNumberKeys {
+		raw := strings.TrimSpace(r.FormValue(fkey))
+		if raw == "" {
+			fields[fkey] = nil
+			continue
+		}
+		f, err := strconv.ParseFloat(raw, 64)
+		if err != nil {
+			adminError(w, http.StatusBadRequest, fmt.Sprintf("%s: %v", fkey, err))
+			return
+		}
+		fields[fkey] = f
+	}
+	raw := strings.TrimSpace(r.FormValue("light"))
+	fields["light"] = raw == "on" || raw == "true" || raw == "1"
+
+	if err := applyFieldsToWidget(preset, fields); err != nil {
+		adminError(w, http.StatusBadRequest, err.Error())
+		return
+	}
+	if err := editor.save(); err != nil {
+		adminError(w, http.StatusBadRequest, err.Error())
+		return
+	}
+	http.Redirect(w, r, a.Config.Server.BaseURL+"/edit/theme-settings", http.StatusSeeOther)
+}
+
+func (a *application) handleAdminDeletePreset(w http.ResponseWriter, r *http.Request) {
+	if !a.adminAccessAllowed(w, r) {
+		return
+	}
+	key := r.PathValue("key")
+
+	editor, err := loadConfigEditor(a.ConfigPath)
+	if err != nil {
+		adminError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	theme, err := findOrCreateKey(editor.topMapping(), "theme", false, yaml.MappingNode)
+	if err != nil {
+		http.Redirect(w, r, a.Config.Server.BaseURL+"/edit/theme-settings", http.StatusSeeOther)
+		return
+	}
+	presetsNode, err := findOrCreateKey(theme, "presets", false, yaml.MappingNode)
+	if err != nil {
+		http.Redirect(w, r, a.Config.Server.BaseURL+"/edit/theme-settings", http.StatusSeeOther)
+		return
+	}
+	removeKeyFromMapping(presetsNode, key)
+
+	if err := editor.save(); err != nil {
+		adminError(w, http.StatusBadRequest, err.Error())
+		return
+	}
+	http.Redirect(w, r, a.Config.Server.BaseURL+"/edit/theme-settings", http.StatusSeeOther)
+}
+
 // ---------- site settings (branding) ----------
 
 var brandingFieldKeys = []string{

internal/glance/admin.go

@@ -19,6 +19,7 @@ var (
 	adminPageSettingsTemplate = mustParseTemplate("admin-page-settings.html", "document.html", "footer.html")
 	adminSiteSettingsTemplate  = mustParseTemplate("admin-site-settings.html", "document.html", "footer.html")
 	adminThemeSettingsTemplate = mustParseTemplate("admin-theme-settings.html", "document.html", "footer.html")
+	adminThemePresetTemplate   = mustParseTemplate("admin-theme-preset.html", "document.html", "footer.html")
 )
 
 // allWidgetTypes mirrors the switch in newWidget(). Aliases ("stocks") omitted.
@@ -264,6 +265,7 @@ type adminTemplateData struct {
 
 	SiteSettings  *adminSiteSettings
 	ThemeSettings *adminThemeSettings
+	PresetForm    *adminPresetFormData
 
 	Backups []adminBackupSummary
 }
@@ -278,6 +280,118 @@ type adminThemeSettings struct {
 	ContrastMultiplier       float32
 	TextSaturationMultiplier float32
 	CustomCSSFile            string
+	Presets                  []adminPresetItem
+	CatalogThemes            []catalogTheme
+}
+
+type adminPresetItem struct {
+	Key                      string
+	BackgroundColorHex       string
+	PrimaryColorHex          string
+	PositiveColorHex         string
+	NegativeColorHex         string
+	Light                    bool
+	ContrastMultiplier       float32
+	TextSaturationMultiplier float32
+	PreviewHTML              template.HTML
+}
+
+type adminPresetFormData struct {
+	Key                      string
+	BackgroundColorHex       string
+	PrimaryColorHex          string
+	PositiveColorHex         string
+	NegativeColorHex         string
+	Light                    bool
+	ContrastMultiplier       float32
+	TextSaturationMultiplier float32
+	IsNew                    bool
+	ErrorMessage             string
+}
+
+type catalogTheme struct {
+	Name        string
+	Key         string
+	PreviewHTML template.HTML
+	BgHex       string
+	PrimaryHex  string
+	PositiveHex string
+	NegativeHex string
+	Light       bool
+	CM          float32
+	TSM         float32
+}
+
+var builtinThemeCatalog []catalogTheme
+
+func parseHSLStr(s string) *hslColorField {
+	if s == "" {
+		return nil
+	}
+	matches := hslColorFieldPattern.FindStringSubmatch(s)
+	if len(matches) != 4 {
+		return nil
+	}
+	h, _ := strconv.ParseFloat(matches[1], 64)
+	sat, _ := strconv.ParseFloat(matches[2], 64)
+	l, _ := strconv.ParseFloat(matches[3], 64)
+	return &hslColorField{H: h, S: sat, L: l}
+}
+
+func safeHex(c *hslColorField) string {
+	if c == nil {
+		return ""
+	}
+	return c.ToHex()
+}
+
+func init() {
+	type rawEntry struct {
+		name, key, bg, primary, positive, negative string
+		cm, tsm                                     float32
+		light                                       bool
+	}
+	entries := []rawEntry{
+		{"Teal City", "teal-city", "225 14 15", "157 47 65", "", "", 1.1, 0, false},
+		{"Catppuccin Frappe", "catppuccin-frappe", "229 19 23", "222 74 74", "96 44 68", "359 68 71", 1.2, 0, false},
+		{"Catppuccin Macchiato", "catppuccin-macchiato", "232 23 18", "220 83 75", "105 48 72", "351 74 73", 1.2, 0, false},
+		{"Catppuccin Mocha", "catppuccin-mocha", "240 21 15", "217 92 83", "115 54 76", "347 70 65", 1.2, 0, false},
+		{"Camouflage", "camouflage", "186 21 20", "97 13 80", "", "", 1.2, 0, false},
+		{"Gruvbox Dark", "gruvbox-dark", "0 0 16", "43 59 81", "61 66 44", "6 96 59", 0, 0, false},
+		{"Kanagawa Dark", "kanagawa-dark", "240 13 14", "51 33 68", "", "358 100 68", 1.2, 0, false},
+		{"Tucan", "tucan", "50 1 6", "24 97 58", "", "209 88 54", 0, 0, false},
+		{"Dracula", "dracula", "231 15 21", "265 89 79", "135 94 66", "0 100 67", 1.2, 0, false},
+		{"Shades of Purple", "shades-of-purple", "243 33 25", "50 100 49", "98 82 71", "12 77 52", 1.2, 0, false},
+		{"Neon Pink", "neon-pink", "240 27 11", "321 100 71", "165 78 51", "360 100 71", 1.5, 0, false},
+		{"Catppuccin Latte", "catppuccin-latte", "220 23 95", "220 91 54", "109 58 40", "347 87 44", 1.0, 0, true},
+		{"Peachy", "peachy", "28 40 77", "155 100 20", "", "0 100 60", 1.1, 0.5, true},
+		{"Zebra", "zebra", "0 0 95", "0 0 10", "", "0 90 50", 0, 0, true},
+	}
+	for _, e := range entries {
+		p := themeProperties{
+			BackgroundColor:          parseHSLStr(e.bg),
+			PrimaryColor:             parseHSLStr(e.primary),
+			PositiveColor:            parseHSLStr(e.positive),
+			NegativeColor:            parseHSLStr(e.negative),
+			ContrastMultiplier:       e.cm,
+			TextSaturationMultiplier: e.tsm,
+			Light:                    e.light,
+			Key:                      e.key,
+		}
+		_ = p.init()
+		builtinThemeCatalog = append(builtinThemeCatalog, catalogTheme{
+			Name:        e.name,
+			Key:         e.key,
+			PreviewHTML: p.PreviewHTML,
+			BgHex:       safeHex(p.BackgroundColor),
+			PrimaryHex:  safeHex(p.PrimaryColor),
+			PositiveHex: safeHex(p.PositiveColor),
+			NegativeHex: safeHex(p.NegativeColor),
+			Light:       e.light,
+			CM:          e.cm,
+			TSM:         e.tsm,
+		})
+	}
 }
 
 type adminSiteSettings struct {
@@ -462,6 +576,39 @@ func hexOf(c *hslColorField) string {
 	return c.ToHex()
 }
 
+func (a *application) freshPresetsFromDisk() []adminPresetItem {
+	contents, _, err := parseYAMLIncludes(a.ConfigPath)
+	if err != nil {
+		return nil
+	}
+	cfg, err := newConfigFromYAML(contents)
+	if err != nil {
+		return nil
+	}
+	var keys []string
+	for k := range cfg.Theme.Presets.Items() {
+		keys = append(keys, k)
+	}
+	items := make([]adminPresetItem, 0, len(keys))
+	for _, key := range keys {
+		p, _ := cfg.Theme.Presets.Get(key)
+		p.Key = key
+		_ = p.init()
+		items = append(items, adminPresetItem{
+			Key:                      key,
+			BackgroundColorHex:       safeHex(p.BackgroundColor),
+			PrimaryColorHex:          safeHex(p.PrimaryColor),
+			PositiveColorHex:         safeHex(p.PositiveColor),
+			NegativeColorHex:         safeHex(p.NegativeColor),
+			Light:                    p.Light,
+			ContrastMultiplier:       p.ContrastMultiplier,
+			TextSaturationMultiplier: p.TextSaturationMultiplier,
+			PreviewHTML:              p.PreviewHTML,
+		})
+	}
+	return items
+}
+
 func (a *application) handleAdminThemeSettings(w http.ResponseWriter, r *http.Request) {
 	if !a.adminAccessAllowed(w, r) {
 		return
@@ -477,12 +624,71 @@ func (a *application) handleAdminThemeSettings(w http.ResponseWriter, r *http.Re
 		ContrastMultiplier:       t.ContrastMultiplier,
 		TextSaturationMultiplier: t.TextSaturationMultiplier,
 		CustomCSSFile:            t.CustomCSSFile,
+		Presets:                  a.freshPresetsFromDisk(),
+		CatalogThemes:            builtinThemeCatalog,
 	}
 	data := adminTemplateData{App: a, ThemeSettings: settings}
 	a.populateTemplateRequestData(&data.Request, r)
 	renderAdminTemplate(w, adminThemeSettingsTemplate, data)
 }
 
+func (a *application) handleAdminThemePreset(w http.ResponseWriter, r *http.Request) {
+	if !a.adminAccessAllowed(w, r) {
+		return
+	}
+	key := r.PathValue("key")
+	var form adminPresetFormData
+
+	if key == "" || key == "new" {
+		form.IsNew = true
+		q := r.URL.Query()
+		form.Key = q.Get("name")
+		form.BackgroundColorHex = q.Get("bg")
+		form.PrimaryColorHex = q.Get("primary")
+		form.PositiveColorHex = q.Get("positive")
+		form.NegativeColorHex = q.Get("negative")
+		form.Light = q.Get("light") == "true"
+		if cm := q.Get("cm"); cm != "" {
+			if v, err := strconv.ParseFloat(cm, 32); err == nil {
+				form.ContrastMultiplier = float32(v)
+			}
+		}
+		if tsm := q.Get("tsm"); tsm != "" {
+			if v, err := strconv.ParseFloat(tsm, 32); err == nil {
+				form.TextSaturationMultiplier = float32(v)
+			}
+		}
+	} else {
+		presets := a.freshPresetsFromDisk()
+		found := false
+		for _, p := range presets {
+			if p.Key == key {
+				form = adminPresetFormData{
+					Key:                      p.Key,
+					BackgroundColorHex:       p.BackgroundColorHex,
+					PrimaryColorHex:          p.PrimaryColorHex,
+					PositiveColorHex:         p.PositiveColorHex,
+					NegativeColorHex:         p.NegativeColorHex,
+					Light:                    p.Light,
+					ContrastMultiplier:       p.ContrastMultiplier,
+					TextSaturationMultiplier: p.TextSaturationMultiplier,
+					IsNew:                    false,
+				}
+				found = true
+				break
+			}
+		}
+		if !found {
+			a.handleNotFound(w, r)
+			return
+		}
+	}
+
+	data := adminTemplateData{App: a, PresetForm: &form}
+	a.populateTemplateRequestData(&data.Request, r)
+	renderAdminTemplate(w, adminThemePresetTemplate, data)
+}
+
 func (a *application) handleAdminSiteSettings(w http.ResponseWriter, r *http.Request) {
 	if !a.adminAccessAllowed(w, r) {
 		return

internal/glance/glance.go

@@ -457,6 +457,8 @@ func (a *application) server() (func() error, func() error) {
 	mux.HandleFunc("GET /edit/pages/{page}/settings", a.handleAdminPageSettings)
 	mux.HandleFunc("GET /edit/site-settings", a.handleAdminSiteSettings)
 	mux.HandleFunc("GET /edit/theme-settings", a.handleAdminThemeSettings)
+	mux.HandleFunc("GET /edit/theme-settings/presets/new", a.handleAdminThemePreset)
+	mux.HandleFunc("GET /edit/theme-settings/presets/{key}", a.handleAdminThemePreset)
 	mux.HandleFunc("GET /edit/pages/{page}/widgets/{col}/{idx}", a.handleAdminWidget)
 
 	mux.HandleFunc("POST /edit/api/pages", a.handleAdminAddPage)
@@ -483,6 +485,9 @@ func (a *application) server() (func() error, func() error) {
 	mux.HandleFunc("POST /edit/api/restore/{n}", a.handleAdminRestoreFromBackup)
 	mux.HandleFunc("POST /edit/api/site-settings", a.handleAdminUpdateSiteSettings)
 	mux.HandleFunc("POST /edit/api/theme-settings", a.handleAdminUpdateTheme)
+	mux.HandleFunc("POST /edit/api/theme-presets", a.handleAdminCreateOrUpdatePreset)
+	mux.HandleFunc("POST /edit/api/theme-presets/{key}", a.handleAdminCreateOrUpdatePreset)
+	mux.HandleFunc("POST /edit/api/theme-presets/{key}/delete", a.handleAdminDeletePreset)
 
 	if a.RequiresAuth {
 		mux.HandleFunc("GET /login", a.handleLoginPageRequest)

internal/glance/templates/admin-theme-preset.html

@@ -0,0 +1,84 @@
+{{- template "document.html" . }}
+
+{{- define "document-title" }}{{ if .PresetForm.IsNew }}Add preset{{ else }}Edit preset — {{ .PresetForm.Key }}{{ end }} - {{ .App.Config.Branding.AppName }}{{ end }}
+
+{{- define "document-body" }}
+<div class="flex flex-column body-content">
+    <main class="content-bounds" style="padding-block: 2rem;">
+        <div class="margin-bottom-15">
+            <a class="color-subdue" href="{{ .App.Config.Server.BaseURL }}/edit/theme-settings">← Theme settings</a>
+        </div>
+        <h1 class="size-h1 margin-bottom-15">{{ if .PresetForm.IsNew }}Add preset{{ else }}Edit preset <code>{{ .PresetForm.Key }}</code>{{ end }}</h1>
+
+        {{ if .PresetForm.ErrorMessage }}
+        <p class="color-negative margin-bottom-15">{{ .PresetForm.ErrorMessage }}</p>
+        {{ end }}
+
+        {{ if .PresetForm.IsNew }}
+        <form method="post" action="{{ .App.Config.Server.BaseURL }}/edit/api/theme-presets"
+              style="display:flex;flex-direction:column;gap:1rem;max-width:36rem;">
+        {{ else }}
+        <form method="post" action="{{ .App.Config.Server.BaseURL }}/edit/api/theme-presets/{{ .PresetForm.Key }}"
+              style="display:flex;flex-direction:column;gap:1rem;max-width:36rem;">
+        {{ end }}
+
+            {{ if .PresetForm.IsNew }}
+            <label class="form-label widget-header">
+                Preset name (key)
+                <input type="text" name="name" class="input" value="{{ .PresetForm.Key }}" placeholder="my-dark-theme" required
+                       pattern="[^\s:{}&#91;&#93;|>&amp;*]+" title="No spaces or special characters">
+                <small class="color-subdue size-h5">Used as the key in YAML and in the theme picker. Lowercase kebab-case recommended.</small>
+            </label>
+            {{ end }}
+
+            <fieldset style="border:1px solid var(--color-widget-content-border);border-radius:4px;padding:1rem;">
+                <legend class="color-subdue size-h5">Colors</legend>
+                <div style="display:grid;grid-template-columns:1fr auto;gap:0.75rem;align-items:center;">
+                    <label for="bg">Background</label>
+                    <input id="bg" type="color" name="background-color"
+                           value="{{ if .PresetForm.BackgroundColorHex }}{{ .PresetForm.BackgroundColorHex }}{{ else }}#151823{{ end }}">
+
+                    <label for="pc">Primary (accent)</label>
+                    <input id="pc" type="color" name="primary-color"
+                           value="{{ if .PresetForm.PrimaryColorHex }}{{ .PresetForm.PrimaryColorHex }}{{ else }}#e4cf8d{{ end }}">
+
+                    <label for="ps">Positive</label>
+                    <input id="ps" type="color" name="positive-color"
+                           value="{{ if .PresetForm.PositiveColorHex }}{{ .PresetForm.PositiveColorHex }}{{ else }}#7fbf7f{{ end }}">
+
+                    <label for="ng">Negative</label>
+                    <input id="ng" type="color" name="negative-color"
+                           value="{{ if .PresetForm.NegativeColorHex }}{{ .PresetForm.NegativeColorHex }}{{ else }}#e07f7f{{ end }}">
+                </div>
+            </fieldset>
+
+            <fieldset style="border:1px solid var(--color-widget-content-border);border-radius:4px;padding:1rem;">
+                <legend class="color-subdue size-h5">Tweaks</legend>
+
+                <label class="form-label widget-header" style="display:flex;flex-direction:row;align-items:center;gap:0.5rem;margin-bottom:0.75rem;">
+                    <input type="checkbox" name="light" {{ if .PresetForm.Light }}checked{{ end }}>
+                    <span>Light mode</span>
+                </label>
+
+                <label class="form-label widget-header">
+                    Contrast multiplier
+                    <input type="number" step="0.05" min="0.5" max="2.0" name="contrast-multiplier" class="input"
+                           value="{{ if .PresetForm.ContrastMultiplier }}{{ .PresetForm.ContrastMultiplier }}{{ end }}" placeholder="1.0">
+                </label>
+
+                <label class="form-label widget-header" style="margin-top:0.75rem;">
+                    Text saturation multiplier
+                    <input type="number" step="0.05" min="0" max="2.0" name="text-saturation-multiplier" class="input"
+                           value="{{ if .PresetForm.TextSaturationMultiplier }}{{ .PresetForm.TextSaturationMultiplier }}{{ end }}" placeholder="1.0">
+                </label>
+            </fieldset>
+
+            <div class="flex gap-10 margin-top-10">
+                <button type="submit">{{ if .PresetForm.IsNew }}Add preset{{ else }}Save{{ end }}</button>
+                <a class="color-subdue" style="align-self:center;" href="{{ .App.Config.Server.BaseURL }}/edit/theme-settings">Cancel</a>
+            </div>
+        </form>
+    </main>
+    {{ template "footer.html" . }}
+</div>
+{{- end }}

internal/glance/templates/admin-theme-settings.html

@@ -9,10 +9,10 @@
             <a class="color-subdue" href="{{ .App.Config.Server.BaseURL }}/edit">← Edit</a>
         </div>
         <h1 class="size-h1 margin-bottom-15">Theme</h1>
+
+        <h2 class="size-h3 margin-bottom-10" style="margin-top:0;">Default theme</h2>
         <p class="color-subdue margin-bottom-25">
-            Colors are stored as HSL in the YAML, but the picker below shows hex
-            for convenience — Glance converts on save. Theme presets and custom CSS
-            beyond the file path still need YAML.
+            Colors are stored as HSL in the YAML, but the picker below shows hex for convenience.
         </p>
 
         <form method="post" action="{{ .App.Config.Server.BaseURL }}/edit/api/theme-settings"
@@ -74,6 +74,61 @@
                 <a class="color-subdue" style="align-self:center;" href="{{ .App.Config.Server.BaseURL }}/edit">Cancel</a>
             </div>
         </form>
+
+        {{/* ── Presets ── */}}
+        <div style="margin-top:2.5rem;max-width:36rem;">
+            <div class="flex" style="justify-content:space-between;align-items:baseline;margin-bottom:0.75rem;">
+                <h2 class="size-h3" style="margin:0;">Presets</h2>
+                <a href="{{ .App.Config.Server.BaseURL }}/edit/theme-settings/presets/new"
+                   style="font-size:0.85rem;">+ Add preset</a>
+            </div>
+
+            {{ if .ThemeSettings.Presets }}
+            <div style="display:flex;flex-direction:column;gap:0.5rem;">
+                {{ range .ThemeSettings.Presets }}
+                <div style="display:flex;align-items:center;gap:0.75rem;padding:0.5rem 0.75rem;border:1px solid var(--color-widget-content-border);border-radius:4px;">
+                    <div style="flex-shrink:0;pointer-events:none;">{{ .PreviewHTML }}</div>
+                    <span style="flex:1;font-weight:500;">{{ .Key }}</span>
+                    <a href="{{ $.App.Config.Server.BaseURL }}/edit/theme-settings/presets/{{ .Key }}"
+                       style="font-size:0.85rem;">Edit</a>
+                    <form method="post" action="{{ $.App.Config.Server.BaseURL }}/edit/api/theme-presets/{{ .Key }}/delete"
+                          style="display:inline;" onsubmit="return confirm('Delete preset {{ .Key }}?')">
+                        <button type="submit" class="color-negative"
+                                style="background:none;border:none;cursor:pointer;font-size:0.85rem;padding:0;">Delete</button>
+                    </form>
+                </div>
+                {{ end }}
+            </div>
+            {{ else }}
+            <p class="color-subdue size-h5">No custom presets yet. Add one below or import from the built-in catalog.</p>
+            {{ end }}
+        </div>
+
+        {{/* ── Built-in catalog ── */}}
+        <div style="margin-top:2rem;max-width:36rem;">
+            <details>
+                <summary class="size-h3" style="cursor:pointer;user-select:none;margin-bottom:0.75rem;">
+                    Built-in theme catalog
+                </summary>
+                <p class="color-subdue size-h5 margin-bottom-15">
+                    Click a theme to open the preset form pre-filled with its colors. You can rename it before saving.
+                </p>
+                <div style="display:grid;grid-template-columns:repeat(auto-fill,minmax(11rem,1fr));gap:0.5rem;">
+                    {{ range .ThemeSettings.CatalogThemes }}
+                    {{- $cm := "" }}{{- if .CM }}{{- $cm = printf "%g" .CM }}{{ end }}
+                    {{- $tsm := "" }}{{- if .TSM }}{{- $tsm = printf "%g" .TSM }}{{ end }}
+                    {{- $light := "" }}{{- if .Light }}{{- $light = "true" }}{{ end }}
+                    <a href="{{ $.App.Config.Server.BaseURL }}/edit/theme-settings/presets/new?name={{ .Key }}&bg={{ .BgHex }}&primary={{ .PrimaryHex }}&positive={{ .PositiveHex }}&negative={{ .NegativeHex }}&light={{ $light }}&cm={{ $cm }}&tsm={{ $tsm }}"
+                       style="text-decoration:none;display:flex;flex-direction:column;align-items:center;gap:0.4rem;padding:0.6rem;border:1px solid var(--color-widget-content-border);border-radius:4px;transition:border-color 0.15s;"
+                       onmouseover="this.style.borderColor='var(--color-primary)'" onmouseout="this.style.borderColor='var(--color-widget-content-border)'">
+                        <div style="pointer-events:none;">{{ .PreviewHTML }}</div>
+                        <span class="size-h5" style="text-align:center;color:var(--color-text-base);">{{ .Name }}</span>
+                    </a>
+                    {{ end }}
+                </div>
+            </details>
+        </div>
+
     </main>
     {{ template "footer.html" . }}
 </div>