Offline Work mode + Reconcile Offline Work dialog, menu tooltips, spinner fix; v0.3.0

- Explicit Work Offline toggle (P4V-style): stops server polling, calm offline banner, persisted
- Reconcile Offline Work dialog: preview adds/edits/deletes with per-file checkboxes, opens picked into a changelist
- Make writable (offline edit) context action; backend p4_reconcile_preview/apply + p4_set_writable
- Tooltips (title) on every top-menu item, 5 languages
- Fix .ldr spinner rendering (inline-block + box-sizing) so it's a clean circle everywhere

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/p4.ts

@@ -74,6 +74,9 @@ export const p4 = {
   filelog: (depot: string) => invoke<Record<string, unknown>>("p4_filelog", { depot }),
   cleanPreview: (scope = "") => invoke<OpenedFile[]>("p4_clean_preview", { scope }),
   cleanApply: (scope = "") => invoke<string>("p4_clean_apply", { scope }),
+  reconcilePreview: (scope = "") => invoke<OpenedFile[]>("p4_reconcile_preview", { scope }),
+  reconcileApply: (paths: string[]) => invoke<OpenedFile[]>("p4_reconcile_apply", { paths }),
+  setWritable: (paths: string[], writable: boolean) => invoke<string>("p4_set_writable", { paths, writable }),
   jobs: () => invoke<{ Job?: string; Status?: string; Description?: string; User?: string; [k: string]: unknown }[]>("p4_jobs"),
   fix: (job: string, change: string) => invoke<string>("p4_fix", { job, change }),
   jobSpec: (job: string) => invoke<string>("p4_job_spec", { job }),