feat(timeline): milestone dates, zoom, pan, sorting + profile-gated landing

[huhn511]

What

Timeline milestones become first-class dated lanes, plus zoom/pan/sort. All six items came from live discovery feedback and were browser-verified against the local pod.

Timeline

• Epic dates — Epic gains optional startDate/endDate (parsed mindp:/ekai:-tolerant). Undated milestones render as a muted dashed future ghost with an INACTIVE badge + legend entry instead of a blank lane.
• Auto-start — moving a milestone's first task to In progress stamps mindp:startDate = today in epics.ttl via the pod write backend (setEpicStartDate). Verified live: the lane loses INACTIVE and grows an active bar starting at Today.
• Merged Runtime/Done bar — one bar: green fill = work done, vertical marker = where elapsed time says we should be. Fill behind the marker = behind schedule.
• Zoom + pan — Quarter / Month / Week toggle; track widens at finer zooms inside a horizontally-scrollable pane with a frozen label column, ‹ / Today / › nav, and auto-centring on today.
• Sorting — by start (default; undated sink to the bottom), by name, by progress.

Landing / i18n

• Profile-gate the assistant + partners sections so the default OSS build doesn't advertise Chat or render an empty partners list.
• Moved the login-callback string into the i18n table (loginCompleting, en + de).

Demo seeds

• Both seed scripts (CSS + mind-node) ship three milestones — Discovery (dated, active), Launch (undated → inactive), Audit (dated, done) — so the timeline showcases every state.

Verification

• npx tsc --noEmit → clean.
• Browser-driven (Playwright MCP) against local mind-node pod: merged bar, inactive ghost, live auto-start, all three zooms with auto-center, pan with frozen labels, and a real sort reorder.

🤖 Generated with Claude Code

[huhn511]

Self-review (can't approve own PR)

Data model — Epic.startDate/endDate parse is mindp:/ekai:-tolerant for back-compat reads. setEpicStartDate is a pure string rewrite in the same idiom as rewriteIssue: matches the epic block, replaces-or-inserts after a mc:Epic ;, prepends mindp:/xsd: prefixes if absent — safe no-op when the block isn't found.

Auto-start — maybeStartEpic is best-effort: skips silently with no epics doc, on a non-ok GET, or when the milestone already has a start date; only PUTs when the rewrite changes the TTL. Gated on state === "in-progress" so it fires exactly when a milestone's first work begins.

Timeline — frozen-label pattern (sticky bg-card cells + scaled inner width + auto-center effect) is sound; started/ghost logic cleanly separates active bars from inactive dashed ghosts. Sort comparators fall back to epic.number for stability.

Landing — profile-gating consistent; Eyebrow index numbering shifts correctly when the assistant section is hidden.

Typecheck clean, browser-verified end-to-end.