fix(install-e2e): windows transcripts were empty; player gets #zip= hash + one player per run

Windows transcripts were ZERO bytes: ts-prefix.ps1 formatted with
{0:D2}, but Floor() returns a double and the D specifier is
integer-only - it threw per line, and under the driver's relaxed EAP
every line errored into the void. {0:00} fixes it (custom numeric
format works on doubles). Reproduced the exact pipeline locally
(empty file + Format specifier invalid), verified the fix produces
prefixed merged stdout+stderr with exit code intact. That is also
why the log timeline never auto-synced: there was nothing in the
files to sync.

The GitHub artifact URL 307s to /suites/... server-side and strips
the ?zip= query param. The player now reads the zip URL from a
#zip= HASH param (client-side, survives the redirect) with ?zip=
as fallback; the hash path was verified in a real browser against a
real leg zip (auto-fetch + boot).

Per ethie's design, one player artifact for the whole run: new
leg-player job uploads playback.html (archive:false) before the
matrix legs, the report job needs it, and each ran cell gets TWO
links - 📼 to the player with #zip=<that leg's logs zip> and ⬇️ to
the raw zip. Per-leg player uploads removed from all three run
workflows.

.github/workflows/install-e2e-windows-run.yml

@@ -119,16 +119,6 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Upload leg player
-        if: always()
-        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
-        with:
-          name: install-e2e-player-${{ inputs.leg-id }}
-          path: tests/install/e2e-assets/playback.html
-          archive: false
-          retention-days: 14
-          if-no-files-found: error
-
       # One recording mechanism on every OS: the composite action installs
       # ffmpeg (cached - winget's download is the slow part), starts the
       # capture, and record-stop fails on a zero-frame file so a silently