Docs: fix Media & Sharing section drift after pin/media management

[selfcontained]

Nightly docs audit — Media & Sharing deep dive (next_focus), aligned with PR #808 (agent pin and media management).

Audited the entire in-app Media & Sharing section against media-sidebar.tsx, media-content.tsx, the dispatch_share/dispatch_list_media/dispatch_delete_media MCP handlers, media.ts route (upload + injection), shared/media.ts (formats), and terminal-uploads.ts.

Verified accurate (unchanged): supported formats, 32KB content cap, update param, simulator capture, source filter values, 50-item media list, four sidebar tabs, drawer/pinned modes, mobile overlay, drag-drop/paste injection paths (clipboard for images, [File #N] path fallback), Mod+Shift+> shortcut. #808 already documented the new tools in tools.tsx and README.

Fixed drift in docs-sections/media.tsx:

• "Click any agent's media count badge" — no such per-agent badge exists; the real affordance is the media sidebar button in the terminal top bar with its unseen-count badge.
• Pins tab: documented update-in-place semantics and the new dispatch_list_pins + dispatch_delete_pin removal flow (the dispatch_pindelete param is now deprecated).
• Unseen media items are highlighted (glow border) with a tab count — not "marked with a badge".
• Share file button is at the top of the Media tab, not "the top of the sidebar".

Deferred: nothing new; next run → Repo Tools section audit.

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