feat: reworked the category editing

specs/editor_settings.allium

@@ -14,7 +14,6 @@ value SettingsView {
     active_sections: List<String>       -- visible sections after search filter
     project_section: SettingsProjectSection?
     editor_section: SettingsEditorSection?
-    categories: List<SettingsCategoryRow>
     ai_section: SettingsAISection?
     technology_section: SettingsTechnologySection?
     publishing_section: SettingsPublishingSection?
@@ -42,16 +41,6 @@ value SettingsEditorSection {
     hide_unchanged_regions: Boolean     -- checkbox
 }
 
-value SettingsCategoryRow {
-    name: String                        -- read-only for protected categories
-    title: String                       -- editable
-    render_in_lists: Boolean            -- checkbox
-    show_titles: Boolean                -- checkbox
-    post_template_slug: String?         -- select
-    list_template_slug: String?         -- select
-    is_protected: Boolean               -- true for: article, aside, page, picture
-}
-
 value SettingsAISection {
     online: SettingsAIEndpoint
     airplane: SettingsAIEndpoint
@@ -97,11 +86,6 @@ value SettingsDataSection {
     rebuild_targets: List<String>       -- posts | media | scripts | templates | links | thumbnails | embedding
 }
 
-invariant SettingsProtectedCategories {
-    -- Protected categories (article, aside, page, picture) cannot be deleted.
-    -- Their Remove button is disabled.
-}
-
 invariant SettingsMCPAgents {
     -- MCP section has exactly 7 agent rows in this order:
     -- Claude Code, Claude Desktop, GitHub Copilot, Gemini CLI,

specs/frontmatter.allium

@@ -314,6 +314,8 @@ value CategoryMetaJson {
 value CategorySettings {
     renderInLists: Boolean
     showTitle: Boolean
+    title: String?
+    titles: Map<String, String>
     postTemplateSlug: String?
     listTemplateSlug: String?
 }

specs/metadata.allium

@@ -29,6 +29,7 @@ surface PublishingPreferencesSurface {
 
 value CategoryRenderSettings {
     title: String?
+    titles: Map<String, String>         -- translated titles keyed by language
     render_in_lists: Boolean
     show_title: Boolean
     post_template_slug: String?
@@ -78,7 +79,9 @@ invariant MetadataPersistedAsFiles {
     -- sshMode, sshRemotePath, sshUser (nil keys absent; sshMode defaults to scp).
     -- Category names and per-category keys are byte-order sorted; per-category
     -- keys are listTemplateSlug, postTemplateSlug, renderInLists, showTitle,
-    -- title. categories.json uses case-sensitive byte-order sorting. tags.json
+    -- title, titles. The title is for the main language; titles contains
+    -- configured translations keyed by language. categories.json uses
+    -- case-sensitive byte-order sorting. tags.json
     -- remains case-insensitively name-sorted; entry keys are color, name,
     -- postTemplateSlug and blank optional values are absent.
 }

specs/rendering.allium

@@ -222,6 +222,13 @@ rule BuildListAssigns {
     ensures: ListRenderAssigns
 }
 
+invariant CategoryArchiveTitleLanguage {
+    -- A category archive uses the title configured for its render language.
+    -- The main-language archive uses title; translated archives use the entry
+    -- in titles keyed by their language; a missing title falls back to the
+    -- category name.
+}
+
 invariant SharedRenderPathForPreviewAndGeneration {
     -- Preview and generation produce identical HTML for the same input because
     -- both build assigns through this subsystem and render via the same Liquid

specs/sidebar_views.allium

@@ -447,16 +447,15 @@ value SettingsNavEntry {
 }
 
 invariant SettingsNavSections {
-    -- Settings navigation has exactly 9 entries in this fixed order:
+    -- Settings navigation has exactly 8 entries in this fixed order:
     -- 1. section="project",     icon="folder",     label_key="settings.nav.project"
     -- 2. section="editor",      icon="notepad",    label_key="settings.nav.editor"
-    -- 3. section="content",     icon="clipboard",  label_key="settings.nav.content"
-    -- 4. section="ai",          icon="robot",      label_key="settings.nav.ai"
-    -- 5. section="technology",  icon="gear",       label_key="settings.nav.technology"
-    -- 6. section="publishing",  icon="rocket",     label_key="settings.nav.publishing"
-    -- 7. section="data",        icon="database",   label_key="settings.nav.data"
-    -- 8. section="mcp",         icon="plug",       label_key="settings.nav.mcp"
-    -- 9. section="style",       icon="palette",    label_key="settings.nav.style"
+    -- 3. section="ai",          icon="robot",      label_key="settings.nav.ai"
+    -- 4. section="technology",  icon="gear",       label_key="settings.nav.technology"
+    -- 5. section="publishing",  icon="rocket",     label_key="settings.nav.publishing"
+    -- 6. section="data",        icon="database",   label_key="settings.nav.data"
+    -- 7. section="mcp",         icon="plug",       label_key="settings.nav.mcp"
+    -- 8. section="style",       icon="palette",    label_key="settings.nav.style"
     -- Labels are localised via their label_key through i18n.
 }
 
@@ -513,10 +512,11 @@ value TagsNavEntry {
 }
 
 invariant TagsNavSections {
-    -- Tags navigation has exactly 3 entries in this fixed order:
+    -- Tags navigation has exactly 4 entries in this fixed order:
     -- 1. section="cloud",   icon="cloud",   label_key="tags.nav.cloud"     -- tag cloud visualisation
     -- 2. section="manage",  icon="pencil",  label_key="tags.nav.manage"    -- create/edit tags
     -- 3. section="merge",   icon="merge",   label_key="tags.nav.merge"     -- merge duplicate tags
+    -- 4. section="categories", icon="list",  label_key="tags.nav.categories" -- edit categories
     -- Labels are localised via their label_key through i18n.
 }
 
@@ -559,6 +559,39 @@ rule TagsNavClick {
     -- Active section is persisted across sidebar switches
 }
 
+value CategoryEditor {
+    main_language: String
+    translation_languages: List<String>
+    rows: List<CategoryEditorRow>
+}
+
+value CategoryEditorRow {
+    name: String
+    titles: Map<String, String>
+    render_in_lists: Boolean
+    show_title: Boolean
+    post_template_slug: String?
+    list_template_slug: String?
+    is_protected: Boolean
+}
+
+surface CategoryEditorSurface {
+    context editor: CategoryEditor
+
+    exposes:
+        editor.main_language
+        editor.translation_languages
+        editor.rows.count
+
+    @guarantee TableLayout
+        -- Category settings render as one table. Its first title column is the
+        -- main language and every configured translation language adds one
+        -- further title column.
+
+    @guarantee ProtectedCategories
+        -- article, aside, page, and picture cannot be removed.
+}
+
 -- ─── 8. Chat view ─────────────────────────────────────────────
 
 -- Follows SidebarEntityListPattern.