chore: CLI v2.1.75–v2.1.80 audit and support (#223–#232) (#233)

## Summary

This PR implements all tickets filed from the CLI v2.1.74 → v2.1.80 changelog audit (issues #223–#232).

### Changes by Issue

- **#223** — `feat: handle Elicitation and ElicitationResult hook events`
  New `ElicitationModal.svelte` component, Rust parsing for `[Elicitation Hook]` and `[ElicitationResult Hook]`, new store methods, and TypeScript event types.

- **#224** — `feat: handle StopFailure hook event for API error turns`
  Rust parsing for `[StopFailure Hook]`; frontend shows error toast + error character state.

- **#225** — `feat: handle PostCompact hook event`
  Rust parsing for `[PostCompact Hook]`; frontend shows info toast + success character state.

- **#226** — `feat: expose --name CLI flag as session name at startup`
  Added `session_name` field to `ClaudeStartOptions`; `StatusBar.doConnect()` passes the conversation name.

- **#227** — `fix: tighten startup watchdog and correct misleading comment`
  Startup watchdog tightened from 60 s → 30 s; corrected a comment that said "5 minutes" whilst the code used 60 seconds.

- **#228** — `fix: document cost estimation review and update default model fallback`
  Default model fallback updated from `claude-sonnet-4-5-20250929` → `claude-sonnet-4-6`; added doc comment explaining why char-based estimation is unaffected by v2.1.75 token overcounting fix.

- **#229** — `chore: update supported CLI version constant to 2.1.80`
  `SUPPORTED_CLI_VERSION` bumped in `CliVersion.svelte`.

- **#230** — `feat: surface memory file last-modified timestamps in MemoryBrowserPanel`
  Backend populates `last_modified` Unix timestamp; frontend formats and displays it per file.

- **#231** — `feat: update max_output_tokens upper bound and helper text for 128k`
  Input max raised to 128 000; placeholder and helper text updated to reflect model-dependent defaults and 128 k ceiling for Opus/Sonnet 4.6.

- **#232** — `fix: document non-streaming fallback compatibility with mid-session watchdog`
  Added doc comment above `STUCK_TIMEOUT` explaining the 5-minute watchdog is intentionally larger than the CLI's 2-minute non-streaming API fallback.

---

✨ This PR was created with help from Hikari~ 🌸

Reviewed-on: #233
Co-authored-by: Hikari <hikari@nhcarrigan.com>
Co-committed-by: Hikari <hikari@nhcarrigan.com>

src/lib/stores/toasts.ts

@@ -68,6 +68,13 @@ function createToastStore() {
     setTimeout(() => remove(id), 4000);
   }
 
+  function addError(message: string) {
+    const id = crypto.randomUUID();
+    const toast: InfoToast = { id, kind: "info", message, icon: "⚠️" };
+    update((toasts) => [...toasts, toast]);
+    setTimeout(() => remove(id), 6000);
+  }
+
   function addAchievement(achievement: AchievementUnlockedEvent["achievement"]) {
     const id = crypto.randomUUID();
     const toast: AchievementToast = { id, kind: "achievement", achievement };
@@ -82,7 +89,7 @@ function createToastStore() {
     // Update toasts are persistent — no auto-dismiss
   }
 
-  return { subscribe, addInfo, addAchievement, addUpdate, remove };
+  return { subscribe, addInfo, addError, addAchievement, addUpdate, remove };
 }
 
 export const toastStore = createToastStore();