feat(meeting): opt-in process-list reminder when a meeting app starts

Default off. When on, the layout polls detect_meeting_processes every 15s
with the user's app-name patterns. On a fresh match (edge-triggered — no
re-toast until the app goes away and comes back) we fire a reminder toast
that tells the user which meeting app appeared and their global hotkey. We
never start recording on this signal; the ideology rule says the user
decides. The signal is a single channel: process list match only — no mic
activity heuristic, no calendar.

Backend adds kon_core::process_watch::{list_running_process_names,
match_meeting_patterns} over sysinfo, exposed to the frontend as the
detect_meeting_processes Tauri command.

Settings ships two new fields — meetingAutoCapture (bool) and
meetingAutoCaptureApps (string[]) — with a comma-separated input in the
Output section. Default app list is ["zoom", "teams"], user-editable.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/lib/pages/SettingsPage.svelte

@@ -1518,6 +1518,28 @@
                 label="Auto-paste into focused window"
                 description={pasteBackendsDescription}
               />
+              <Toggle
+                bind:checked={settings.meetingAutoCapture}
+                label="Remind me when a meeting starts"
+                description="Toasts when a matching app appears in the process list. You still hit the hotkey — Kon never records on its own."
+              />
+              {#if settings.meetingAutoCapture}
+                <div class="ml-[50px] mt-2 mb-1 animate-fade-in">
+                  <p class="text-[10px] font-medium text-text-tertiary uppercase tracking-wider mb-1.5">Apps to watch (comma-separated)</p>
+                  <input
+                    type="text"
+                    class="w-full bg-bg-input border border-border-subtle rounded-lg px-3 py-1.5 text-[12px] text-text"
+                    value={settings.meetingAutoCaptureApps.join(", ")}
+                    oninput={(event) => {
+                      const raw = event.currentTarget.value;
+                      settings.meetingAutoCaptureApps = raw
+                        .split(",")
+                        .map((entry) => entry.trim().toLowerCase())
+                        .filter((entry) => entry.length > 0);
+                    }}
+                  />
+                </div>
+              {/if}
               <Toggle bind:checked={settings.includeTimestamps} label="Include timestamps in exports" />
               <Toggle
                 bind:checked={settings.saveAudio}

src/lib/stores/page.svelte.ts

@@ -47,6 +47,8 @@ const defaults: SettingsState = {
   britishEnglish: true,
   autoCopy: true,
   autoPaste: false,
+  meetingAutoCapture: false,
+  meetingAutoCaptureApps: ["zoom", "teams"],
   includeTimestamps: true,
   theme: "Dark",
   fontSize: 14,

src/lib/types/app.ts

@@ -37,6 +37,8 @@ export interface SettingsState {
   britishEnglish: boolean;
   autoCopy: boolean;
   autoPaste: boolean;
+  meetingAutoCapture: boolean;
+  meetingAutoCaptureApps: string[];
   includeTimestamps: boolean;
   theme: "Dark" | "Light" | "System";
   fontSize: number;