docs(timeline): document /zeitstrahl, lib/timeline, monthBuckets move; RTM #779

Route tables (CLAUDE.md + frontend/CLAUDE.md), the document/timeline.ts ->
$lib/shared/utils/monthBuckets move (document + shared READMEs), GLOSSARY
Lebensweg entry, the c4 l3-frontend people-stories diagram, and the RTM rows
REQ-001..027 for feature zeitstrahl-global-view (#779), all marked Done.

Refs #779
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/architecture/c4/l3-frontend-3c-people-stories.puml

@@ -14,6 +14,7 @@ System_Boundary(frontend, "Web Frontend (SvelteKit / SSR)") {
     Component(geschichten, "/geschichten and /geschichten/[id]", "SvelteKit Routes", "Story/Journey list and detail pages. List: GeschichteListRow with REISE badge for JOURNEY type. Detail: dispatches to StoryReader (rich text + persons) or JourneyReader (intro + ordered JourneyItemCard/JourneyInterlude items + empty state) based on GeschichteType. BLOG_WRITE users see edit/delete actions. Loader: GET /api/geschichten, GET /api/geschichten/{id}.")
     Component(geschichtenEdit, "/geschichten/[id]/edit and /geschichten/new", "SvelteKit Routes", "Story editor and creation flow. New: TypeSelector (STORY/JOURNEY radio group with roving tabindex) → StoryCreate (TipTap rich text, person linking, POST /api/geschichten) or JourneyCreate (title + first item). Edit: branches on GeschichteType — STORY opens GeschichteEditor (TipTap body + GeschichteSidebar incl. StoryDocumentPanel: document linking via POST/DELETE /items); JOURNEY opens JourneyEditor (title, intro textarea, ordered JourneyItemRow list with drag-reorder + move-up/down, JourneyAddBar for document/interlude addition, GeschichteSidebar). JourneyEditor mutations: POST/DELETE /items, PUT /items/reorder, PATCH /items/{id}. Requires BLOG_WRITE permission.")
     Component(stammbaum, "/stammbaum", "SvelteKit Route", "Family tree visualisation. Loader: GET /api/network (nodes + edges). Renders interactive family tree from network graph data.")
+    Component(zeitstrahl, "/zeitstrahl", "SvelteKit Route", "Global timeline (Zeitstrahl). SSR loader: GET /api/timeline -> TimelineDTO. Renders lib/timeline/TimelineView (Datum mode): year bands (YearBand) with EventPill / WorldBand / LetterCard, dense-year YearLetterStrip (shared Sparkline + monthHistogram), folded GapSpan for empty-year runs, and an undated bucket. personId prop is the per-person Lebensweg seam (issue #10), undefined here.")
     Component(themen, "/themen", "SvelteKit Route", "Browsable topic index. Shows all root tags as cards with color bars and child rows. ThemenWidget also embedded in the home dashboard (reader + editor sidebar). Loader: GET /api/tags/tree.")
     Component(profilePage, "/profile", "SvelteKit Route", "Current user profile settings. Loader: GET /api/users/me/notification-preferences. Actions: update name/password and notification preferences.")
     Component(userProfile, "/users/[id]", "SvelteKit Route", "Public user profile view. Loader: GET /api/users/{id}.")
@@ -27,6 +28,8 @@ Rel(aktivitaeten, backend, "GET /api/dashboard/activity, GET /api/notifications"
 Rel(geschichten, backend, "GET /api/geschichten, GET /api/geschichten/{id}, DELETE /api/geschichten/{id}", "HTTP / JSON")
 Rel(geschichtenEdit, backend, "GET /api/persons/{id} (pre-populate), POST /api/geschichten, PUT /api/geschichten/{id}, POST/DELETE /api/geschichten/{id}/items, PUT /api/geschichten/{id}/items/reorder, PATCH /api/geschichten/{id}/items/{itemId}", "HTTP / JSON")
 Rel(stammbaum, backend, "GET /api/network", "HTTP / JSON")
+Rel(user, zeitstrahl, "Reads the family timeline", "HTTPS / Browser")
+Rel(zeitstrahl, backend, "GET /api/timeline -> TimelineDTO", "HTTP / JSON")
 Rel(themen, backend, "GET /api/tags/tree", "HTTP / JSON")
 Rel(profilePage, backend, "GET/PUT /api/users/me, notification-preferences", "HTTP / JSON")
 Rel(userProfile, backend, "GET /api/users/{id}", "HTTP / JSON")