[mikahatdichlieb]

Summary

• Adds a "View buffered entries" button on the connected screen, opening a local diagnostic list of what's still in the Room buffer (package name, collected time, duration), capped at the 200 most recent with a note when more are buffered.
• GET /api/v1/events is session-auth only (see docs/wire-format.md); a device token can't use it, so this is a read of the device's own buffer only — no new data collected or sent.
• README updated with the new feature.

Closes #19

Test plan

• ktlintCheck, detekt, lint, testDebugUnitTest all pass (85 tests, 0 failures)
• Manual check on a device: pair, let a few entries buffer, open the new screen, confirm the list and the truncation note (if any) look right