feat(tg): Mini App V6 — premium overhaul (#609)

* feat(tg): Mini App V6 — premium overhaul (design system, Chat parity, Metrics drilldown, CEO verbs)

Design system: native type with tabular-numeral heroes (mono demoted to
the wordmark), borderless elevated cards, floating dock, Telegram
window-chrome painting via the theme bridge; Inbox moves behind a header
bell with humanized notifications (UUIDs resolve to task names).

Chat: honest Mine/Fleet split — participant-scoped CEO threads with real
unread counts and mark-read, watched fleet threads with reply-as-CEO on
task-linked conversations (watch-only otherwise), markdown transcripts,
live pulse flashes, and a pinned Secretary live chat on the panel's SSE
session runtime.

Metrics: new tab with period-segmented spend hero, by-agent/team/model
breakdowns, delivery + efficiency health, and a per-agent drilldown over
usage time-series (agent_slug) + member scorecard.

Board: tg-native grouped pipeline replacing the MobileTaskBoard wrapper;
task sheet gains the CEO decide verbs (approve / request changes /
unblock).

Security: /api/dashboard router now require_panel_token-gated at router
level (mirrors /api/usage), closing unauthenticated metrics exposure.

* fix(tg): restore Share Tech Mono brand voice, Phosphor icon set, borderless avatars

The mono returns as the numeral/brand voice (.tg-display — heroes, stat
values, wordmark) while labels stay native sentence case. The hand-drawn
duotone glyphs and lucide feature icons are replaced by Phosphor (MIT):
duotone at rest via an IconContext at the shell, filled weight on the
dock's active tab; row glyph maps (board statuses, inbox kinds, approval
kinds, quick actions) all move over. Team avatar tiles drop their borders
— tint-only squircles.

* fix(tg): fleet avatar strip breathes — spaced tiles instead of overlap

* polish(tg): taste-skill audit pass — em-dash purge, one icon family, separator rationing

Applied the design-taste audit against the cockpit: every em-dash in
visible UI copy rewritten (periods/commas/colons), the remaining lucide
chrome (carets, arrows, send, close, spinners) moved to Phosphor so the
tg tree ships one icon family (send is the native paper-plane, carets
bold), the hand-rolled chevron SVG deleted, and metadata lines rationed
to a single middle-dot separator.

* polish(tg): pipeline chip strip scrolls without a visible scrollbar

* fix(tests): metrics observability fixture uses a relative timestamp

The hardcoded _T0 (2026-06-20) aged out of the service's 30-day window
exactly 30 days later, detonating the suite on every branch. Two days
back from now() stays inside every window (30d metrics, 7d scorecards)
permanently.

---------

Co-authored-by: Renn F <rennf93@users.noreply.github.com>

panel/package.json

@@ -19,6 +19,7 @@
     "@dnd-kit/sortable": "^10.0.0",
     "@dnd-kit/utilities": "^3.2.2",
     "@hookform/resolvers": "^5.4.0",
+    "@phosphor-icons/react": "^2.1.10",
     "@radix-ui/react-alert-dialog": "^1.1.19",
     "@radix-ui/react-avatar": "^1.2.2",
     "@radix-ui/react-checkbox": "^1.3.7",