feat(app): consolidate web UI fixes, session toolbar, and OmniRoute provider

[afonsoft]

Issue for this PR

This PR consolidates a set of web UI fixes for packages/app/packages/session-ui/packages/ui/packages/web and adds two related features: a Devin-style action toolbar on the session header and an OmniRoute/9router provider entry with automatic model discovery for config-defined OpenAI-compatible providers.

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

This PR does three things on the web app (packages/app, packages/session-ui, packages/ui, packages/web):

1. Consolidates a batch of small, targeted web UI fixes (session header, home sessions view, timeline rendering, composer, terminal, draft store, markdown sharing, layout) into one branch.
2. Adds a Devin-style action toolbar to the session header (Files, Tasks, Progress, Terminal, Review buttons) with per-tool enable/disable switches under Settings -> General -> Advanced.
3. Adds "OmniRoute / 9router" to Popular Providers: the connect dialog asks only for Base URL + API key, and the backend auto-discovers models from {baseURL}/models for config-defined OpenAI-compatible providers.

It also fixes a scalability bug found while E2E-testing that feature: the model pickers rendered every model unvirtualized, which froze the tab with a ~8k-model gateway; rendering is now capped at 200 items with a "keep typing to filter" hint.

1. Consolidated web UI fixes

Small, targeted fixes across the web app surface:

• packages/app/src/components/dialog-connect-provider.tsx — improved provider connect dialog behavior.
• packages/app/src/components/session/session-header.tsx — right-side header actions refactored into a generic tool list (see below); also switches path copy to the shared copyText helper.
• packages/app/src/components/session/open-in-app.tsx, terminal.tsx, pages/home.tsx, pages/home/home-sessions*.tsx, pages/layout(-new).tsx, pages/session/composer/session-permission-dock.tsx, pages/session/timeline/message-timeline.tsx, utils/draft-store.ts — assorted UI correctness fixes.
• packages/session-ui — markdown.tsx, message-part.tsx, tool-error-card.tsx, v2 prompt-input/attachments.ts rendering fixes.
• packages/ui — text-field.tsx fix; new shared clipboard.tsx (copyText) and digest.tsx components.
• packages/web/src/components/share/content-markdown.tsx — share-page markdown fix.
• packages/opencode/src/server/shared/ui.ts, src/tool/code-mode.ts — minor supporting fixes.
• Extracted theme/language command registration into packages/app/src/pages/layout/theme-language-commands.ts with unit tests.

2. Session header action toolbar

The session header previously exposed a single review toggle (#opencode-v2-icon-sidebar-right, tooltip-v2-trigger). It now renders a tool list — Files, Tasks, Progress (context), Terminal, Review — modeled on Devin-style workbench actions:

• Each button invokes the existing real action: tabs().open(SESSION_OPEN_FILE_TAB) / "context" for Files/Progress, terminal toggle, reviewPanel.toggle(), todoCollapsed for Tasks (disabled when the session has no todos).
• Buttons show pressed state while their panel is open.
• New per-tool toggles under Settings → General → Advanced (showSessionReview, showSessionFiles, showSessionTerminal, showSessionTasks, showSessionProgress; all default on) let users hide tools they don't use. Desktop-only, preserving previous visibility behavior.
• All new copy goes through i18n keys added for every locale.

3. OmniRoute / 9router provider + auto model discovery

• "OmniRoute / 9router" added to Popular Providers (settings-v2/providers.tsx) with a dedicated connect dialog (dialog-omniroute-provider.tsx) that takes only a Base URL and API key, then writes provider.omniroute (npm: "@ai-sdk/openai-compatible") to config and stores the key in the auth store.
• packages/opencode/src/provider/provider.ts: config-defined OpenAI-compatible providers with no declared models are now auto-populated by fetching {baseURL}/models once at provider-list build time. Guarded so it only applies to source: "config" providers with npm unset-or-@ai-sdk/openai-compatible and a baseURL; failures return empty and the provider is dropped as before. Timeout is 30s — real gateways (e.g. OmniRoute serving ~8k models) answer in ~9s, so a tighter bound produced silent empty results.
• Verified end-to-end against a live OmniRoute gateway: connect → 7,990 models discovered and individually toggleable in Settings → Models.

4. Model picker scalability fix (found during E2E)

• Connecting a large gateway (~8k models) exposed that both model pickers rendered every model as full components, freezing the tab. Both are now capped at 200 rendered items with a "keep typing to filter" footer hint; search still covers the full set.
• packages/ui: new List limit prop backed by exported limitGroups (list-limit.ts) with unit tests; List renders a list-more row when truncated.
• packages/app/src/components/dialog-select-model.tsx: ModelList passes limit; the v2 popover controller slices results and exposes hidden for the hint row.
• New i18n keys dialog.model.more / ui.list.more in all locales.

How did you verify your code works?

• bun run test:unit in packages/app — 728 tests pass, including new theme-language-commands.test.ts.
• bun test test/provider/ test/tool/ in packages/opencode — 1086 tests pass, including a new openai-compatible-discovery.test.ts (discovers models, keeps declared models, skips non-openai-compatible npm, drops unreachable endpoints).
• bun turbo typecheck — all 30 packages pass.
• Live E2E: connected an OmniRoute gateway through the new dialog; backend discovered 7,990 models; OmniRoute group renders under Settings → Models.

Screenshots / recordings

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

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