Day 8: Splash screen + license gate flow

Rust IPC commands:
  LicenseResult, ExaminerProfile, DriveInfo structs
  check_license() → returns dev pro license result (replaces stub)
  activate_license(key) → accepts STRATA-* keys, returns Pro tier;
    rejects others with "Invalid license key format" error
  start_trial() → returns Trial tier with 30 days
  get_examiner_profile() → returns empty profile (replaces stub)
  save_examiner_profile(profile) → console-prints saved name
  list_drives() → 2 mock drives: Macintosh HD (system, blocked) +
    Wolfmark Systems Backup (931 GB external, permitted)
  select_evidence_drive(id) → returns evidence path

TypeScript IPC:
  Mirrored types and 7 functions (checkLicense, activateLicense,
  startTrial, getExaminerProfile, saveExaminerProfile, listDrives,
  selectEvidenceDrive). All wired with IN_TAURI fallbacks so the
  full flow works in Vite preview.

Store additions:
  AppGate type ('splash' | 'examiner' | 'drive' | 'main')
  gate (default 'splash'), licenseResult, examinerProfile,
  selectedDriveId, evidencePath, isDevMode (default true)
  setGate, setLicenseResult, setExaminerProfile (also updates
  examinerName), setSelectedDrive

Shared gate components:
  GateBackground — full-screen radial-gradient wrapper
  ChevronMark — extracted reusable SVG (Day 7's About-tab chevron)
  DevSkip — bottom-left amber-bordered DEV SKIP button

SplashScreen (production):
  Full-screen with radial gradient. Chevron 100x88, STRATA 52px
  wordmark, tagline, version line. Animated entrance via gateFadeUp
  + gateFade keyframes (CSS animations: chevron up, then text rows
  staggered 200/400/500/700/800ms). Centered divider gradient.
  License key input (44px, monospace, validates) with error state
  border. Start Trial button (white gradient, primary). Activate
  License button switches style when key is typed. Footer
  copyright. DEV SKIP advances to examiner gate.

ExaminerSetup:
  480px card on gradient background. ID-card icon, title, subtitle.
  4 form fields (Name/Agency/Badge required, Email optional) with
  inline validation, red borders + error text on submit. Continue
  button validates then saves profile + advances to drive gate.
  Back link returns to splash. DEV SKIP fills dev values + advances.

DriveSelection:
  520px card. Floppy icon, title, 2-line warning. Loads drives via
  listDrives on mount. Each drive row: monitor/disc icon, name +
  free/total GB, monospace mount path, red warning text + ✗ for
  not-permitted, ✓ for selected. System drive non-clickable +
  greyed out. Hover state for permitted drives. Refresh button.
  Evidence path preview when drive selected. Begin Examination
  button disabled until selection. Back link returns to examiner.
  DEV SKIP picks Wolfmark drive + advances to main.

App.tsx:
  Added gate routing — splash/examiner/drive return their respective
  components, main returns the existing layout.

TopBar:
  LicenseBadge component with Pro/Trial/None variants.
  Case name now shows "{shortName} · {caseName}" when examiner
  profile is set. shortName turns "Dev Examiner" → "D. Examiner".

CSS animations:
  Added @Keyframes gateFade and gateFadeUp to index.css for the
  splash screen entrance.

Verified in browser preview:
  - Splash renders with chevron, STRATA wordmark, license card,
    DEV SKIP visible
  - DEV SKIP → Examiner Setup with 4 fields, ID icon, primary button
  - DEV SKIP → Drive Selection with 2 drives (1 blocked, 1 selectable)
  - Click Wolfmark drive → blue selection + ✓, evidence path preview,
    Begin Examination button activates
  - Click Begin Examination → Main workspace with case name
    "D. Examiner · Unsaved Session"
  - Zero console errors

Builds:
  npm run build: 316 KB JS, 7.15 KB CSS, 52 modules — clean
  cargo check: clean
  cargo tauri build --no-bundle: 8.8 MB binary

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: WolfmarkSystems

.github/workflows/tauri-build.yml

@@ -0,0 +1,80 @@
+name: Build Strata Desktop (Tauri)
+
+on:
+  push:
+    tags:
+      - 'v*'
+  workflow_dispatch:
+
+jobs:
+  build-tauri:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - platform: macos-latest
+            args: '--target aarch64-apple-darwin'
+            rust-targets: 'aarch64-apple-darwin'
+          - platform: macos-latest
+            args: '--target x86_64-apple-darwin'
+            rust-targets: 'x86_64-apple-darwin'
+          - platform: ubuntu-22.04
+            args: ''
+            rust-targets: ''
+          - platform: windows-latest
+            args: ''
+            rust-targets: ''
+
+    runs-on: ${{ matrix.platform }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: ${{ matrix.rust-targets }}
+
+      - name: Install Linux dependencies
+        if: matrix.platform == 'ubuntu-22.04'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y \
+            libwebkit2gtk-4.1-dev \
+            libappindicator3-dev \
+            librsvg2-dev \
+            patchelf \
+            libssl-dev \
+            build-essential \
+            curl \
+            wget \
+            file \
+            libgtk-3-dev \
+            libayatana-appindicator3-dev
+
+      - name: Install frontend dependencies
+        working-directory: apps/strata-ui
+        run: npm install
+
+      - name: Build Tauri app
+        uses: tauri-apps/tauri-action@v0
+        with:
+          projectPath: apps/strata-desktop/src-tauri
+          args: ${{ matrix.args }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Upload build artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: strata-${{ matrix.platform }}-${{ matrix.rust-targets || 'default' }}
+          path: |
+            apps/strata-desktop/src-tauri/target/release/bundle/
+            apps/strata-desktop/src-tauri/target/*/release/bundle/
+          if-no-files-found: warn