feat(archive): add local-save archive with subscription UI

desktop/playwright.config.ts

@@ -36,6 +36,7 @@ export default defineConfig({
         "**/profile-active-turn.spec.ts",
         "**/config-bridge-screenshots.spec.ts",
         "**/observer-feed-screenshots.spec.ts",
+        "**/local-archive-screenshots.spec.ts",
         "**/file-attachment.spec.ts",
         "**/image-attachment-gallery.spec.ts",
         "**/video-attachment.spec.ts",

desktop/scripts/check-file-sizes.mjs

@@ -60,6 +60,14 @@ const overrides = new Map([
   // config-bridge: get_agent_config_surface/write_agent_config_field/put_agent_session_config
   // commands add ~40 lines. Queued to split.
   // branch cut; override bumped to cover the merged total. Queued to split.
+  // archive/mod.rs carries the full test module: 899 unit tests + 4 real-relay
+  // integration tests (ignored, live-relay only, wrapped in
+  // #[cfg(not(target_os = "windows"))] mod real_relay). The test module is the
+  // source of the overage — production logic is ~408 lines. The fix-round added
+  // 2 regression tests (F2: out-of-range kind + F3: atomicity invariant).
+  // read_archived_events Tauri command added ~39 lines (Phase 1 read-back).
+  // Queued to split the test module into archive/mod_tests.rs in a follow-up.
+  ["src-tauri/src/archive/mod.rs", 1440],
   ["src-tauri/src/commands/agents.rs", 1437],
   // #1418 read-path fix: get_thread_replies' blocker fix (shared TIMELINE_KINDS
   // const + build_thread_replies_filter helper, mirroring the channel sibling so