ux: filter findings, non-preview open, quieter copy toasts

[dmartinochoa]

Three small UX wins from the post-v0.2.0 review queue. Stacked on ux-polish-2 (#20).

#5 — Filter the Findings tree

• Pipeline-Check: Filter Findings command opens an InputBox; matches against rule ID, message body, and file path (case-insensitive substring). Re-invoke pre-fills the current filter so users can edit or clear (empty input clears).
• New $(filter) button on the Findings view title bar.
• FindingsTreeProvider gets getFilter/setFilter/applyFilter. The badge tracks the filtered count; lastFindingUris still tracks the unfiltered universe so a publish for a currently-hidden URI still wakes the tree up (otherwise a CLEAR of a filtered-out finding would never refresh).
• 8 tests covering: default empty, rule-id match, case-insensitivity, message-body match, fsPath match, clear via empty string, whitespace trim, badge reflects filtered count.

#4 — Open Finding (non-preview)

• Pipeline-Check: Open Finding context-menu entry on tree leaves. Opens with preview: false — pins the file as a permanent tab so triaging multiple findings side-by-side doesn't create tab clutter. The single-click default still uses preview, keeping the common "scan through findings" flow lightweight.
• LeafLike type widened to include uri and diagnostic.range.

#7 — Quieter clipboard confirmations

• Copy Rule ID and Copy LSP Install Command switch from showInformationMessage (modal toast) to setStatusBarMessage with a 2-second TTL (CONFIRM_TTL_MS). The copy succeeds silently 95% of the time anyway; the status bar confirmation reads without stealing focus.

Wiring

• package.json: three new command declarations; view/title button for filter (group navigation@1, between scan and changeGrouping); view/item/context entry for openNonPreview (group navigation@0, top of the menu); commandPalette gates the leaf-context commands to false so they don't show palette-wide without a node.
• src/findingsView.ts: filter state + setFilter + getFilter + applyFilter (in findings()); sets the pipelineCheck.filterActive context key so future manifest contributions can paint a "filter active" affordance.
• src/test/integration/activation.test.ts: command-registration expected list grows by filter + openNonPreview.

Total: 137 tests pass (was 129 on #20; +8 filter behaviour). Lint, compile, smoke, integration-compile all green.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d0ec3e4d-3dd6-45e0-b9b3-e7d7a4ae715b

📥 Commits

Reviewing files that changed from the base of the PR and between 60590c5 and a02a90f.

📒 Files selected for processing (6)

• CHANGELOG.md
• package.json
• src/extension.ts
• src/findingsView.test.ts
• src/findingsView.ts
• src/test/integration/activation.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ux-polish-3

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