🎨 Palette: Add placeholders to empty input fields

[google-labs-jules]

🎨 Palette: Add placeholders to empty input fields

💡 What

Added distinct placeholder text to the empty search input fields in the Finder (Ctrl+p) and Grep (Ctrl+f) TUI components. The text is styled with Color::DarkGray to indicate it is a placeholder.

🎯 Why

Empty input fields in the TUI environment can be confusing because they only render a lone cursor or blank space. The placeholders explicitly tell the user what the input field is for ("type to filter" for Finder, "search workspace" for Grep), improving overall discoverability and usability.

♿ Accessibility

The placeholders improve cognitive accessibility by explicitly labeling the purpose of the input fields dynamically. The color contrast uses standard Color::DarkGray to distinguish it from actual input.

Screenshots (Before/After equivalent context)

Before:
> █

After:
> █type to filter (in Finder)
> █search workspace (in Grep)

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PR created automatically by Jules for task 2368805791664604683 started by @Matuyuhi

[google-labs-jules]

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[github-actions]

速度チェック

1 打鍵 (キー入力 → 再描画 1 回) あたりの所要時間。小さいほど速い。

ケース	ops	base	head	差分
open	1	8.588 ms	8.169 ms	-4.9%
type	200	0.238 ms	0.236 ms	-0.8%
scroll-down	300	0.304 ms	0.300 ms	-1.2%
scroll-up	300	0.304 ms	0.304 ms	-0.1%
search-type	9	1.137 ms	1.135 ms	-0.2%
search-scroll	300	0.329 ms	0.329 ms	+0.0%
type-tracked	200	0.265 ms	0.264 ms	-0.2%
git-scroll	300	0.285 ms	0.285 ms	-0.1%
git-scroll-side-wrap	300	0.314 ms	0.314 ms	-0.3%

同じ runner で連続して測った 2 点の比です。実測で数 % はぶれるので、それを超えた行だけ見てください。この結果で PR は落としません。

[Matuyuhi]

Closing this PR for now instead of merging it. The idea (placeholders in the Finder and Grep inputs) is reasonable, but it isn't mergeable as it stands:

1. CI is red. check (ubuntu-24.04) failed on head 66bf2ca. The run's last log lines show only the "no UI diff; skip" step, so I couldn't see the failing step itself. I suspect the screenshot tests: the Finder and Grep views changed, but no docs/preview/*.svg were regenerated with cargo preview --update-snapshots, which CLAUDE.md requires for UI changes.
2. UI strings bypass lang/. "type to filter" and "search workspace" are hardcoded English. Per docs/design/ui-text.md, UI text goes through the lang/ translation table.
3. The cursor sits before the placeholder (> █type to filter), so the placeholder looks like typed input. Putting the placeholder after the cursor on its own would read better, but only once the padding is handled correctly.
4. Unrelated change in .Jules/palette.md. It replaces a $(date …) heading and adds notes that have nothing to do with the code change.

A resubmission should add the strings to lang/, refresh the snapshots, and get cargo build, cargo clippy and cargo fmt --check clean. I did not add the mergeable label.

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