Ship floating launcher, automatic discovery and bounded media search improvements

docs/APPLICATION-SEARCH.md

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+# Local application search
+
+Type an application's name in the desktop search window and open its application
+result. Matching ignores case and spaces; `VS Code` and `vscode` also match
+Visual Studio Code. Application search uses a small local catalog and works
+without downloading an embedding model.
+
+Windows reads user/common Start Menu shortcuts. Registered Microsoft Store
+applications are added in the background using the operating system's
+`Get-StartApps` inventory, with a five-second timeout. The initial window and
+searches do not wait for that inventory. Linux reads visible XDG `.desktop`
+applications and launches them using GIO (`gio launch`); a missing GIO launcher
+produces an explicit error. macOS discovery covers the standard Applications
+directories; actual macOS execution remains untested.
+
+The catalog is refreshed when searchi starts. Restart it after installing an
+application if it has not appeared. Launch commands accept only opaque IDs
+already in this local catalog. Executable paths and command lines are never
+accepted from the webview; Linux desktop-entry parsing is delegated to GIO.
+
+The Windows development machine's actual read-only inventory test passed:
+92 Start Menu shortcuts and 25 registered applications. All four focused module
+tests passed, including VS Code aliases, hidden desktop entries, rejected
+registered-ID command text, and results that do not disclose launch paths.
+This inventory check launches nothing; native application launch/keyboard
+interaction must be verified separately in the final desktop check.