Correct the Media & Sharing docs and cover the guidance trim

[selfcontained]

Nightly docs audit. Deep-dive area was the docs-pane Media & Sharing section (next_focus from the last run), plus one diff-driven addition from #955.

Verified clean

Enumerated as sets in both directions, no change needed: the four sidebar tabs vs MediaSidebarTab, the eight dispatch_pin types, dispatch_share's formats / 32KB content cap / simulator capture / update semantics, the five dispatch_list_media sources, the most-recent-50 media limit, MJPEG-over-CDP streaming with last-frame save, and the eight-pin group auto-collapse with per-agent persistence.

Drift fixed (docs-sections/media.tsx)

• Reviews tab was described as "human review feedback submitted from the Changes tab". It also shows persona reviewer submissions (reviewerType: "agent" from dispatch_review_submit) — the more common case. The claimed three-value badge set was wrong too: reviews-sidebar-row.tsx maps partially_resolved to the Open label, so only Open and Resolved ever render. Rewritten around what the row actually shows, including the resolved count and the Approved · no feedback state.
• Lightbox previews never mentioned the Download action (present on every item) or that the copy button copies the image itself for non-text files.
• Screen streaming omitted the Pop out button that opens the feed in its own window.
• Shortcut pins — on a touch device every shortcut routes through the confirm dialog regardless of confirm, because the hover tooltip that would otherwise show the prompt is unreachable.
• dispatch_delete_pin takes ids and group, not just a single id.

Diff-driven addition (docs-sections/plugin.tsx, tips.ts)

#955 added Settings → Agents → Launch guidance → Use short startup rules with no docs coverage. Added a Shorter startup rules subsection: what it drops, that it's a user assertion rather than plugin detection, that only Claude Code and Codex agents trim (OpenCode/Cursor keep the full ruleset), that job runs are untouched, and that it applies at launch. Plus one ambient tip pointing at the new anchor — since: 0.34.2, confirmed with git merge-base --is-ancestor 31df8ecb 2d441f2c.

Deferred to next run

• docs/03-api-spec.md still has no rows for the agent pins HTTP routes (existing backlog item).
• Pin batch write modes (dispatch_pins merge vs replace) are agent-facing only; not surfaced in the user docs.

pnpm run format:write, pnpm run check, and the tips unit tests all pass.

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