perf(frontend): load only the selected trial on drawer open

[kyle-compute]

What changed

• Removed the task page parent subscription to /api/tasks/{task_id}/detail and the duplicate canonical task/trial state derived from it.
• Made the bounded /api/tasks/{task_id}/open response the task page source for drawer trial navigation.
• Opened trial drawers with the task pane hidden; the existing Show task control mounts the task pane on explicit intent.
• Kept task-pane deep links working when taskPane or taskFile is present.
• Made TaskFilesPanel adopt /detail internally for unscoped task pages while preserving parent-owned experiment scope.
• Deferred task file listing until the File pane is selected.
• Reworked the existing focused Playwright test instead of adding another suite.

The change removes 42 net lines.

Why

The captured production HAR showed a trial drawer click starting four requests:

• /api/tasks/{task_id}/detail: 4.705 seconds, including 3.810 seconds of database handling
• /api/trials/{trial_id}: 2.352 seconds
• /api/tasks/{task_id}/trials: 638 milliseconds
• /api/tasks/{task_id}/files: 4.376 seconds before being aborted

The first three task resources duplicated task and trial information already available from /open or belonged to the hidden task/file panes. The initial trial drawer now owns only the selected-trial resource.

Request shape

Before Show task or another tab is selected:

• /api/trials/{trial_id}: 1
• /api/tasks/{task_id}/detail: 0
• /api/tasks/{task_id}/trials: 0
• /api/tasks/{task_id}/files: 0
• /api/trials/{trial_id}/analysis-log: 0
• /api/trials/{trial_id}/files: 0
• /api/trials/{trial_id}/trajectory: 0

Selecting Show task permits task detail and task-trial requests. Task files remain deferred until the File pane is selected.

Verification

• Application TypeScript check: passed
• Playwright TypeScript check: passed
• ESLint on all changed files: passed
• Prettier check: passed
• Frontend unit tests: 5 passed, 0 failed
• Focused Playwright runtime: 1 skipped locally because E2E_CLERK_EMAIL, CLERK_SECRET_KEY, and NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY are absent

[vercel]

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Project	Deployment	Actions	Updated (UTC)
oddish-app	Ready	Preview	Aug 18, 2026 12:58am

[github-actions]

Oddish preview

Commit: edfe5e24baf40c9c10bc952b0d4ffa011a88d377

Surface	Link	Target
Frontend	https://pr-1283.oddish.app	Vercel preview for edfe5e2
Backend	staging	staging
Database	staging branch	staging branch

Vercel deployment URL: https://oddish-htm4911vn.oddish.app

Plan:

• Frontend deploy: true
• Backend deploy: false
• Migrations: false

This comment is updated by the PR Preview workflow.