fix: make discovered models selectable in the Profile editor

[yujiezhang-ops]

Problem

The Profile editor prefills the Provider's default_model (ProfilesPage.tsx:82), and ModelPicker used that same string as its list filter:

const filtered = models.filter((model) => model.includes(value.trim()));

One string served as both the committed model ID and the search query. A Provider default is rarely among the IDs an endpoint actually returns, so the list rendered "没有匹配的模型" directly below a notice reading "找到 N 个模型" — a count of found models over an empty list, with no way to reach any of them.

Reproduced against the server-mode backend before the fix:

prefilled model: "deepseek/deepseek-v4-pro"
notice:          找到 1 个模型
discovered:      ["oneagent-e2e-model"]

No substring overlap, so nothing was listed.

Fix

Track the typed query separately from the committed model ID, and put the list behind a disclosure arrow on the two Profile editors. The arrow is not cosmetic: an always-open list pushed the editor's footer off screen, and it was also the only missing affordance saying the discovered models were selectable at all. The query resets on commit and on reopening, so a filtered session cannot leave a stale filter behind.

The wizard's model step is a whole page about choosing a model, so there the list stays open and unarrowed — that path is unchanged.

Also fixes two stale e2e selectors left by 8c678c8, which renamed 模板 to 模版 in the UI but not in the spec. pnpm run test:e2e was already failing on main at wails.spec.ts:110 before this branch.

Verification

• npx vitest run — 36 files, 264 passed (9 new in ModelPicker.test.tsx)
• pnpm run build — tsc --noEmit clean
• pnpm run test:e2e — 6 passed, including a new test for this path
• go test ./..., go vet ./... — clean
• python3 scripts/check-docs.py — ok

Both new tests were confirmed to fail against the old filter and pass with the fix, so they pin the regression rather than merely passing.

Computed styles checked in both palettes: the popup background tracks the theme (rgb(255,255,255) → rgb(30,30,32)), input text flips to near-white in dark mode, and the list floats over the footer at z-index: 40 while the footer stays on screen.

🤖 Generated with Claude Code