chore(ci): unblock dependency bumps (Windows FFmpeg guard, vite client types)

.github/workflows/ci-rust.yml

@@ -89,8 +89,24 @@ jobs:
 
       - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
 
+      # choco exits 0 even when the community feed answers 503, so a failed
+      # install used to surface five minutes later as nineteen tests panicking
+      # on "ffmpeg: program not found". Retry the transient failure, then prove
+      # both binaries are callable so this step fails where the cause is.
       - name: Install FFmpeg
-        run: choco install ffmpeg --yes --no-progress
+        shell: pwsh
+        run: |
+          $ErrorActionPreference = 'Continue'
+          $env:PATH = "$env:PATH;$env:ProgramData\chocolatey\bin"
+          foreach ($attempt in 1..3) {
+            choco install ffmpeg --yes --no-progress
+            if (Get-Command ffmpeg -ErrorAction SilentlyContinue) { break }
+            Write-Host "::warning::FFmpeg install attempt $attempt did not produce a binary; retrying."
+            Start-Sleep -Seconds 20
+          }
+          $ErrorActionPreference = 'Stop'
+          ffmpeg -version
+          ffprobe -version
 
       - name: cargo clippy
         run: cargo clippy --all-targets --all-features -- -D warnings

webapp/src/vite-env.d.ts

@@ -0,0 +1 @@
+/// <reference types="vite/client" />