fix(web): prevent drawer close on text drag

[seakee]

Summary

Fix Drawer overlay false close when users drag-select text from inputs onto the mask. Only close when pointer down and up both land on the overlay itself, and add unit coverage for the three press/release paths.

Scope

• Frontend panel
• Manager Server
• CPA panel mode
• Full Docker mode
• Native packages / release
• Docs / Wiki
• CI / build / tooling

Changes

• Replace Drawer overlay onClick close with pointer down/up pairing
• Keep close button and Esc behavior unchanged
• Add Drawer unit tests for overlay press/release vs drag-out cases

User Impact

Provider edit drawers and other Drawer consumers no longer close accidentally when users drag-select text from inputs onto the overlay. Intentional overlay click-to-close still works.

Compatibility / Runtime Notes

• CPA panel mode: frontend-only Drawer behavior; no CPA runtime/API change
• Manager Server mode: frontend-only; no server contract change
• Full Docker / native packages: same embedded frontend behavior after rebuild/release

Data / Security Notes

N/A — no SQLite, credential, auth file, log, raw usage data, or plugin changes.

Risk / Rollback

Risk level: Low

Rollback notes:

• Revert this PR to restore previous overlay onClick close behavior
• No data migration or config change required

Verification

• Type check
• Lint
• Tests
• Build
• Manual UI check
• Docs/link check
• Not applicable, docs-only

Commands / evidence:

npm --workspace apps/web run test -- src/components/ui/Drawer.test.tsx
# Test Files  1 passed (1)
# Tests  3 passed (3)

Screenshots / Recordings

N/A — interaction fix only; no visual layout change. Recommended manual check:

1. Open provider edit drawer
2. Drag-select text from an input onto the overlay → drawer stays open
3. Click overlay background → drawer still closes

Docs

• README / README_CN updated for user-visible capabilities
• Matching docs manual and navigation updated
• Demo fixtures, screenshots, and deep links reviewed
• Release notes needed
• Not needed — explanation included below

Docs decision:
Bugfix for existing Drawer close interaction; no new capability, config surface, or docs path change.

Related

Closes #437