fix: assorted bug fixes for lists, sounds, interrupts, and permissions (#173)

## Summary

- **Markdown lists**: Explicitly set `list-style-type: disc` / `decimal` in the Markdown renderer — Tauri's WebView strips browser defaults, leaving bullets and numbers invisible.
- **Notification sounds**: Moved all per-task sounds (success, error, permission, task-start) from a global `characterState` subscription into the per-conversation `claude:state` event handler, so background tabs receive their sounds correctly and tab-switching never replays a sound that already fired. Closes #172
- **Draft text**: Persists `inputValue` per conversation tab so a half-typed prompt survives switching to another tab and back.
- **Interrupt messages**: Replaced vague "Process interrupted" / "Disconnected" strings with source-specific descriptions (keyboard shortcut, stop button, unexpected crash) so it's clear what actually happened.
- **Silent prompt loss**: When Claude Code exits whilst a prompt is in-flight, emits a visible error line telling the user their last prompt was not processed and to reconnect and retry.
- **Double disconnect**: Added an `intentional_stop` flag to `WslBridge` so that `stop()` / `interrupt()` — which kill the process themselves — suppress the duplicate "Disconnected unexpectedly" message that `handle_stdout`'s EOF path was also emitting.
- **Permission modal**: Fixed two cooperating reactivity bugs — `pendingPermissions` was mutated in-place (`.push()`), causing Svelte's derived-store chain to receive the same array reference and skip re-rendering; `PermissionModal.svelte` also used `$state()` (runes mode) where plain `let` is required for correct store-subscription reactivity.

## Test plan

- [ ] Unordered and ordered lists render with visible bullets and numbers in the chat terminal
- [ ] Completion sound plays once when a background tab finishes; switching back to that tab does not replay it
- [ ] Sounds for error, permission request, and task-start also play for background tabs and do not replay on tab switch
- [ ] Typing a prompt, switching tabs, and switching back restores the draft text
- [ ] Pressing Ctrl+C shows "keyboard shortcut (Ctrl+C)"; clicking the stop button shows "via stop button"
- [ ] If Claude exits mid-request, an error message appears prompting the user to resend
- [ ] Clicking stop or pressing Ctrl+C produces exactly one disconnect message (not two)
- [ ] When a tool requires permission, the permission modal appears and the user can approve or dismiss it

✨ This PR was created with help from Hikari~ 🌸

Reviewed-on: #173
Co-authored-by: Hikari <hikari@nhcarrigan.com>
Co-committed-by: Hikari <hikari@nhcarrigan.com>

src/lib/components/InputBar.svelte

@@ -164,6 +164,17 @@
     attachments = storedAttachments;
   });
 
+  // Per-tab draft persistence — restore the draft text whenever the active
+  // conversation changes, and save it back on every keystroke.
+  claudeStore.activeConversationId.subscribe((conversationId) => {
+    if (conversationId) {
+      const conv = get(claudeStore.conversations).get(conversationId);
+      inputValue = conv?.draftText ?? "";
+    } else {
+      inputValue = "";
+    }
+  });
+
   function handleInputChange() {
     // If input is empty, allow history navigation again
     // Otherwise, mark that user has manually typed
@@ -176,6 +187,12 @@
     historyIndex = -1;
     tempInput = "";
 
+    // Save the current draft so it persists if the user switches tabs.
+    const activeId = get(claudeStore.activeConversationId);
+    if (activeId) {
+      claudeStore.setDraftText(activeId, inputValue);
+    }
+
     if (isSlashCommand(inputValue)) {
       matchingCommands = getMatchingCommands(inputValue);
       showCommandMenu = matchingCommands.length > 0;
@@ -326,7 +343,7 @@ User: ${formattedMessage}`;
         throw new Error("No active conversation");
       }
       await invoke("interrupt_claude", { conversationId });
-      claudeStore.addLine("system", "Process interrupted - reconnecting...");
+      claudeStore.addLine("system", "Process interrupted via stop button — reconnecting...");
       characterState.setState("idle");
 
       // Show connecting status while we reconnect