feat(chat): composer grows to two thirds of the pane, Enter continues lists; drop the fullscreen editor

[Leo310]

What

Removes the desktop-only fullscreen chat editor. The composer now grows with its content up to two thirds of the chat pane; past that, only the editor scrolls. The fullscreen toggle only existed because the editor stopped growing at max-h-[200px].

• Desktop: .chat-root becomes a size container, and the in-flow composer is capped at calc(100cqh * 2 / 3).
• Mobile: the composer is portaled out of the pane, where cqh would fall back to the full viewport and ignore the keyboard. So the portaled rule restates the cap against the pane's own height formula (100vh − view top − keyboard/toolbar band).
• Only the input card shrinks under the cap. The provider banner, pending-changes bar and editing bar keep their size.
• Enter sends and Shift+Enter inserts a newline, as before when not in fullscreen. The fullscreen-only "Enter = newline, Mod+Enter sends" mode goes away, as does the tray row's 2.5rem right-hand reservation for the toggle.

Lists (added in this PR): before, Enter on desktop always sent, so a list could never get a second item (Shift+Enter is Obsidian's plain line break and adds no marker). On a list line (-, *, +, 1., 1), - [ ], indented or quoted), Enter now falls through to Obsidian's own handler. That continues the list, and Enter on an empty item ends it; the next Enter sends. Mod+Enter sends from anywhere, and the send tooltip mentions it. Mobile is unchanged (Enter was already a newline there).

How I tested it

bun run check, format, lint and test pass. Desktop, WT3 slot vault: with a 200-line draft the card stops at 2/3 of the pane (858px of 1287px), the editor scrolls and the send row stays visible. Lists, live in the chat input: - one + Enter gives - ; Enter on the empty bullet removes it; 1. a + Enter gives 2. . isMarkdownListLine has unit tests. The pending-bar and mobile paths are untested live; that is pending the maintainer's own desktop and iOS test (type a long draft, confirm the composer stops at about 2/3 of the pane and the editor scrolls, also with the keyboard open on mobile and with a pending-changes bar showing).

AI assistance: Claude Code wrote the change from Leo's brief ("remove fullscreen chat input, let the input grow to ~2/3 of the chat height", then "Enter should continue Markdown lists"); Leo reviews and tests it live.

Checklist

• bun run check, bun run format, bun run lint, and bun run test pass locally
• I tried the change in a real Obsidian vault (or explained above why that isn't applicable)
• I read CONTRIBUTING.md, including the section on AI assistance
• If this adds a provider, a bundled skill, a built-in tool, or changes manifest.json: I noted that the docs site needs updating (see "Documentation" in CONTRIBUTING.md)

[greptile-apps]

Confidence Score: 5/5

[Medium risk] Chat composer layout and list-handling behavior changes.

No new finding blocks merging, and the earlier findings have been manually resolved.

Summary

The PR removes the fullscreen chat editor, lets the composer grow within the chat pane, and delegates Enter on Markdown list lines to the editor.

• The latest change closes a fence opened in a blockquote when the quote ends and adds tests for that case.

_{Reviews (7) · Last reviewed commit: "fix(chat): a fence opened in a blockquot..."}