feat(web): The Grove — contributor graph, leaderboard, VN i18n & fonts (v0.9.0)

[rumitvn]

Phase 6 — "The Grove" 🎋

Turns the dashboard's team-memory data into an Obsidian-style second brain: the repo trunk, its branches, and the contributors who grew it — plus a "best contributor" leaderboard, a full Vietnamese localization, and a Vietnamese-friendly type system.

Built on the realization that contributor identity already lives in the committed .tre-mem/ JSONL (author, set at tre share/graduate time) — so no schema migration was needed.

What's new

• Grove tab — d3-force + hand-rolled canvas graph. Nodes: root/trunk, branches, contributors, facts (pins = young shoots, graduated = mature culms). Bamboo palette from theme tokens (light/dark aware). Hover tooltips; click a branch/fact to drill into Branch detail, click a contributor to highlight their shoots.
• Contributor leaderboard — weighted value score (pins ×1, graduated ×3) + badges/streaks: Gardener of the week, Most rooted, Longest streak, First sprout.
• Shareable grove card — one-click canvas → PNG with the tre-mem wordmark.
• Growth time-lapse — scrub/replay how the grove grew over time.
• Solo/unshared fallback — backfills contributors from git log authors so a fresh repo is never empty (?fallback=git, flagged git-fallback).
• i18n — EN ⇄ VI toggle (persisted, auto-detects VN browsers), with a deliberately casual/fun Vietnamese voice across every surface; localized timeAgo.
• Type system — Baloo 2 (cute rounded display) + Be Vietnam Pro (VN-native body) with VN-capable system fallbacks; fixes the diacritic stacking the old serif had on "vườn".
• Bug fix — .shell grid had 3 children but only 2 rows, so the nav ballooned on low-content pages; now auto auto 1fr.

Surfaces / files

• Backend: src/sync/read.ts (read-only JSONL reader), src/web/grove.ts (pure aggregators + graph builders + badges), branchAuthors() in src/git/identity.ts, two routes in src/web/api.ts.
• Frontend: web/i18n.tsx, web/views/{Grove,Leaderboard,GraphCanvas,ShareCard}.tsx, Grove tab in web/app.tsx, Overview promo banner, fonts in scripts/build-web.mjs + web/styles.css.
• New runtime dep: d3-force (sim only, ~13 kb bundled). Fonts load from Google Fonts CDN.

Test plan

• pnpm format:check && lint && typecheck && test && build — all green
• 326 tests (+9 new: test/sync-read.test.ts, test/web-grove.test.ts) — covers value-score weighting, null-author bucketing, badges, graph shape, empty case
• Live-verified /api/contributors + /api/graph against this repo (real author, 13-node graph)
• Manual: Grove renders + drills in; EN/VI toggle flips the whole dashboard; share-card PNG; time-lapse; git-fallback on an unshared repo
• Reviewer: skim the Vietnamese copy in web/i18n.tsx for tone/typos

🤖 Generated with Claude Code

[rumitvn]

Merged latest main (the v0.8.0 bamboo green identity) into this branch and resolved the conflicts:

• Version bumped to v0.9.0 — bamboo identity took v0.8.0, so Grove moves to 0.9.0 (package.json + src/version.ts, CHANGELOG split into ordered [0.9.0] + [0.8.0] entries).
• Brand token migration — bamboo renamed --bark → --bamboo (and --bark-ink → --bamboo-deep); migrated every Grove reference (CSS + GraphCanvas + ShareCard + Overview spine) so the graph/leaderboard now use the jade palette.
• web/styles.css header + .lede em (kept font-style: normal since Baloo 2 has no italic, recolored to --bamboo) and CHANGELOG.md were the two real conflicts; app.tsx auto-merged cleanly (BambooMark + i18n coexist).

Full gate green locally: format, lint, typecheck, 326 tests, build.