Add IndexedDB-backed autologging

[ctoth]

Summary

• Add autologging preferences with default-off IndexedDB-backed persistent session storage
• Capture normalized output entries before visible scrollback trimming and batch them into autolog sessions
• Add an Autologs dialog for viewing, downloading TXT/HTML logs, deleting sessions, and clearing all sessions
• Redact sensitive URL parameters from stored session metadata

Verification

• npm run build
• npm test -- --run src/logging/AutoLogStore.test.ts src/logging/AutoLogService.test.ts
• npm test -- --exclude "tests/**"

Note: plain npm test in this local workspace also discovers untracked Playwright specs under tests/** and fails because Vitest cannot execute Playwright test.describe files. The source/tracked Vitest suite passes with tests/** excluded.