Implements the v2 design's game-folder button in the Tauri launcher.
The previous control squeezed the full game-directory path into the
top-bar button as truncated monospace (e.g.
`…s/Desktop/eti_games_AFTER_LAN_2025`). In practice the leading
ellipsis rarely showed the meaningful part of the path, ate
horizontal space the new 3-zone top bar needs for its primary
controls, and competed with the filter / search / sort cluster for
attention.
The button now communicates the *state* of the configuration at a
glance — an icon + short label + colored status dot — while the full
path moves into the native tooltip and `aria-label`, where it stays
one mouseover (and screen-reader friendly) away.
Two visual states, both 36 px tall and sharing the surface of the
other top-bar controls:
- **Set & valid** (`.dirbtn-set`) — label `Game folder`, green dot
(`--ok`) with a soft glow, default border, tooltip = full path.
- **Not set / invalid** (`.dirbtn-unset`) — label `Set game folder`,
red dot (`--danger`) with a soft glow, a red-tinted border, and a
faint red wash on hover so the bad state reads as "this is what
you need to fix". Tooltip = `Please select a game folder`.
`DirectoryButton` now takes `path: string | null` and picks the
state from `!!(path && path.trim())`. The `aria-label` carries the
full state in words (`Game folder: <path>` / `Set game folder`) so
screen readers don't have to interpret the colored dot.
Note: in the current `MainWindow`, `gameDir` is gated upstream — if
no directory is selected, `NoDirectoryState` is shown instead of the
top bar, so the unset state will only surface here if we later
validate disk existence and clear `gameDir`. The button accepts a
nullable path anyway, so it's ready when that check lands.
`truncatePath` in `lib/format.ts` was the only caller-less helper
left behind and is removed.
Test Plan
- `npx tsc --noEmit` from the frontend crate — clean.
- `just frontend-test` — passes.
- Manual: `just run`, pick a valid game directory, and confirm the
top-bar button reads `Game folder` with a green dot; hovering it
reveals the full path in the OS tooltip. Inspect the DOM and
confirm `aria-label` reads `Game folder: <path>`. (The unset
variant currently isn't surfaced by `MainWindow`; eyeball it via
DevTools by toggling the `dirbtn-set` class to `dirbtn-unset`.)
ddidderr
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