UX improvements: inline filter settings, resizable panels, temp directory setting

[StuartCameronCode]

A batch of UX work, plus one pre-existing macOS bug found along the way. Four commits, each independent.

Inline filter settings (e0d8dbc)

Pass settings used to render in a separate panel below the pass list, so the controls you were editing sat far from the filter they belonged to. Each pass now expands in place — tapping a row reveals its settings directly underneath, tapping again collapses it. selectedPass became nullable to allow the collapsed state.

Above each filter's options is a description block: the schema's one-line description, with a More expander revealing a new longDescription covering what the filter does and when you'd reach for it. All twelve core schemas carry one.

Panels are resizable. The new ResizableSplit widget puts a draggable divider between two panes (resize cursor, hover highlight), used for preview ↔ right panel and queue ↔ pipeline list. Dragged sizes persist across launches; double-clicking a divider resets to automatic.

The queue pane's automatic height now follows its contents instead of a fixed 180px, so a single file no longer leaves a mostly-empty box — it grows per item up to 260px, then scrolls.

Opaque macOS window (a27bf98)

WindowOptions carried backgroundColor: Colors.transparent, which has window_manager set the native window to NSColor.clear with isOpaque false. The Flutter view only covers the content area, so nothing painted behind the macOS title bar — it rendered as a floating title and traffic lights over the desktop. Present since the Flutter migration; visible on macOS 26.

Bug reporting, About moved into Settings (c992872)

The toolbar had accumulated an icon per destination. About moves into Settings alongside a new "Report a bug or give feedback" entry that opens the GitHub issue tracker, both under About & Feedback on the General tab. The issues URL is built from githubRepo in deps-version.json, so a fork points at its own tracker.

Settings tabs reordered General, Output, Input, so the tab that opens first holds app-wide settings rather than per-job input options.

Configurable temp directory (449fc3f)

Scratch files — generated .vpy scripts, job config, preview frames, progress files, extracted DVD titles — always went to the system temp directory. A DVD rip alone can need several GB, which is a problem when system temp sits on a small or slow volume. Settings → General → Temporary Files now points them anywhere, with ✕ to reset to the system default.

Two mechanisms cover the two processes:

• Dart call sites go through the new TempDirectoryService.
• Rust needs no per-path plumbing: ToolLocator.workerEnvironment sets TMPDIR/TMP/TEMP from the effective path, so every env::temp_dir() in the worker follows it — scripts, progress files, preview raw frames, GPU probes, the macOS vspipe conf — as do the ffmpeg and vspipe children. Applied per call rather than baked into the cached env map, so a change needs no restart.

Choosing a directory writes a probe file first, so a read-only volume is rejected at selection time rather than failing mid-job. If it later disappears, resolve() recreates it, falling back to system temp if it can't.

Testing

• flutter test --exclude-tags heavy — 227 passing, including 8 new tests in app/test/temp_directory_service_test.dart
• cargo test — 207 passing (subtitle_integration_test needs a locally-downloaded whisper model, unrelated)
• The worker half of the temp redirect was verified directly: generating a script with TMPDIR pointed elsewhere put the .vpy in the override
• The heavy nightly suite has been dispatched against this branch, since the temp-directory change touches every worker spawn

Docs: CLAUDE.md and README.md updated for the temp directory setting, including the two rules a future change could trip on — don't add new Directory.systemTemp uses, and any new worker/tool spawn must pass workerEnvironment.