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.yml

@@ -194,6 +194,30 @@ jobs:
       tag-has-desktop: ${{ matrix.tag_has_desktop }}
       leg-id: ${{ matrix.leg_id }}
 
+  # The leg player: one static HTML for the whole run. Uploaded BEFORE the
+  # matrix legs so it exists even when every leg dies; the report job links
+  # every ran leg to it with that leg's logs zip as a #zip= hash param
+  # (hash survives the artifact URL's server-side redirect, the query does
+  # not). archive: false makes GitHub name the artifact after the FILE
+  # (playback.html), ignoring the name: input -- harmless, the renderer
+  # looks it up by that name.
+  leg-player:
+    name: Upload leg player
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          sparse-checkout: tests/install/e2e-assets/playback.html
+          sparse-checkout-cone-mode: false
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        with:
+          name: install-e2e-player
+          path: tests/install/e2e-assets/playback.html
+          archive: false
+          retention-days: 14
+          if-no-files-found: error
+
   # The outcome, human-readable: the plan chart again, with each cell
   # replaced by how that leg actually concluded. Per-leg conclusions are
   # NOT reachable through `needs` (a matrix job's result collapses to one
@@ -203,7 +227,7 @@ jobs:
   report:
     name: Result chart
     if: always()
-    needs: [pick-releases, linux, windows, macos]
+    needs: [leg-player, pick-releases, linux, windows, macos]
     runs-on: ubuntu-latest
     timeout-minutes: 5
     steps: