TASK 18: manual rename modal for finished recordings

RenameRecordingDialog (themed, mirrors GoLiveWindow chrome): pre-fills the auto stem,
Enter/OK saves, Esc/Cancel keeps the auto name, strips stray .mp4, rejects invalid
filename chars. FinalizeRecordingAsync shows it before UniquePath rename. Naming logic
still covered by RecordingFileTests; UI shell is pure. verify.sh gate: 0 warnings,
244/246 (2 known).

TASKS.md

@@ -951,7 +951,7 @@ click (volume sliders keep their manual `SetSliderValueFromClick`, harmless dupl
 
 **Goal:** record the stream output to a local file, with or without simultaneously streaming.
 
-### Status: ✅ Shipped `a9eb360` (2026-08-29) — code done, build 0 warnings, 244/246 tests; remaining = running-app verification + manual-rename modal
+### Status: ✅ Shipped `a9eb360` (2026-08-29) — code done (incl. manual-rename modal), build 0 warnings, 244/246 tests; remaining = running-app verification
 
 1. ✅ `EncoderOptions` extended with `StreamEnabled` / `RecordEnabled` / `RecordPath` (independent intent flags)
 2. ✅ `FfmpegArgs.Build` reworked into per-output blocks (stream `-f flv`, record `-f mp4`) via `AddVideoTags`
@@ -961,7 +961,7 @@ click (volume sliders keep their manual `SetSliderValueFromClick`, harmless dupl
 6. 🟡 Branding flash carries into local recordings — same frame path as streaming (verify in the running app)
 7. ✅ Output folder `%APPDATA%\ytLlive\recordings\` default; auto-name `ty-<yyyymmdd>-<hhmm start>-0000.mp4` at start, **rename-on-stop** to `ty-…-<hh2mm2 length>.mp4` (numeric suffix on collision)
 
-Remaining: manual rename dialog for the user (toast actions unsupported — modal window was planned but parked), running-app verification of the rename + dual output.
+Remaining: running-app verification of the rename + dual output.
 
 ### Design decisions