fix(quick-capture): keep save button visible with long descriptions

[atman-33]

Summary

• The description textarea in the quick-capture window grew with its content (shared Textarea uses field-sizing-content), and its flex-item wrapper had no floor (min-height: auto) — long descriptions pushed the "Save to inbox" footer out of the window, where the container's overflow-hidden clipped it entirely.
• Pinned the row with min-h-0 + field-sizing-fixed so the textarea fills the remaining space and scrolls internally instead, reusing the idiom already used by the maximized task-dialog editor.
• Set min_inner_size(360, 260) on the quick-capture window so manual resizing can't hide the footer either.
• Documented the fill-vs-grow Textarea idiom in .claude/rules/ui-conventions.md to prevent recurrence.

Related: T-0102

Test plan

• npm run build (tsc + vite) passes; confirmed field-sizing-fixed{field-sizing:fixed} is emitted in the CSS the quick-capture window loads
• cargo fmt --check clean
• cargo clippy --all-targets -- -D warnings clean
• cargo test --release — 185 passed
• Manual: open quick capture, paste a long multi-line description, confirm the Save button stays visible and the textarea scrolls internally (not verified in this environment — the tauri dev window can't be driven headlessly here)

🤖 Generated with Claude Code

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