v3.16.10: fix stale v3.16.5 in status bar (#5364) + ship deferred DM …

…PiP edit fixes

The v3.16.6 commit bumped package.json off-by-one to 3.16.5, and commits v3.16.7/8/9 never bumped it again. Every install since v3.16.6 has reported itself as v3.16.5 via /api/version and session-info. Bumping package.json to 3.16.10 and refreshing all client cache-bust strings in app.html.

Also ships the originally-intended v3.16.5 fixes that were only documented in CHANGELOG but whose code changes (DM PiP edit-message channelCode flow, encrypted upload error detail in toast) were left uncommitted in the working tree.

v3.16.8: clear phantom unread badge when window regains focus (#phant…

…om-badge-on-focus-return)

v3.16.6: update download page and version history

v3.16.4: update site download links and version history

v3.16.0: idempotent Discord import (dedup by snowflake ID, channel re…

…use)

v3.15.9: Polish translation update (dvw1xx, #5356)

v3.15.8: bump cache-bust strings to force browsers to fetch post-3.14…

….14 client JS (#5347)

v3.15.7: update download page to v3.15.7 + version history entries

v3.15.5: update download page to v3.15.5 + version history entries