feat(notifications): add overlay notifications with position config

- Add Catppuccin Macchiato overlay notification stack with 3s transient timeout
- Add `notifications.overlayPosition` config (top-left | top | top-right)
- Route startup tokenization and subtitle annotation status through configured surfaces
- Deduplicate rapid subtitle mode toggle notifications
- Change `both` to mean overlay + system; add `osd-system` as legacy alias for old behavior
- Keep `osd`/`osd-system` as config-file-only legacy values; Settings UI offers overlay/system/both/none

launcher/config-domain-parsers.test.ts

@@ -129,6 +129,11 @@ test('parseLauncherMpvConfig ignores invalid launch mode values', () => {
 test('parsePluginRuntimeConfigFromMainConfig maps config.jsonc values over plugin defaults', () => {
   const parsed = parsePluginRuntimeConfigFromMainConfig({
     auto_start_overlay: false,
+    ankiConnect: {
+      behavior: {
+        notificationType: 'osd-system',
+      },
+    },
     texthooker: {
       launchAtStartup: false,
     },
@@ -148,18 +153,32 @@ test('parsePluginRuntimeConfigFromMainConfig maps config.jsonc values over plugi
   assert.equal(parsed.autoStart, true);
   assert.equal(parsed.autoStartVisibleOverlay, false);
   assert.equal(parsed.autoStartPauseUntilReady, true);
+  assert.equal(parsed.osdMessages, true);
   assert.equal(parsed.binaryPath, '/opt/SubMiner/SubMiner.AppImage');
   assert.equal(parsed.texthookerEnabled, false);
   assert.equal(parsed.aniskipEnabled, false);
   assert.equal(parsed.aniskipButtonKey, 'F8');
 });
 
+test('parsePluginRuntimeConfigFromMainConfig disables plugin osd messages for overlay notification routing', () => {
+  const parsed = parsePluginRuntimeConfigFromMainConfig({
+    ankiConnect: {
+      behavior: {
+        notificationType: 'both',
+      },
+    },
+  });
+
+  assert.equal(parsed.osdMessages, false);
+});
+
 test('parsePluginRuntimeConfigFromMainConfig defaults to background-only managed startup', () => {
   const parsed = parsePluginRuntimeConfigFromMainConfig(null);
 
   assert.equal(parsed.autoStart, true);
   assert.equal(parsed.autoStartVisibleOverlay, false);
   assert.equal(parsed.autoStartPauseUntilReady, true);
+  assert.equal(parsed.osdMessages, false);
   assert.equal(parsed.texthookerEnabled, false);
   assert.equal(parsed.aniskipEnabled, true);
   assert.equal(parsed.aniskipButtonKey, 'TAB');
@@ -175,6 +194,7 @@ test('buildPluginRuntimeScriptOptParts emits config values that override plugin
         autoStart: true,
         autoStartVisibleOverlay: false,
         autoStartPauseUntilReady: true,
+        osdMessages: true,
         texthookerEnabled: false,
         aniskipEnabled: false,
         aniskipButtonKey: 'F8',
@@ -188,6 +208,7 @@ test('buildPluginRuntimeScriptOptParts emits config values that override plugin
       'subminer-auto_start=yes',
       'subminer-auto_start_visible_overlay=no',
       'subminer-auto_start_pause_until_ready=yes',
+      'subminer-osd_messages=yes',
       'subminer-texthooker_enabled=no',
       'subminer-aniskip_enabled=no',
       'subminer-aniskip_button_key=F8',
@@ -205,6 +226,7 @@ test('buildPluginRuntimeScriptOptParts strips script-option delimiters from stri
         autoStart: true,
         autoStartVisibleOverlay: false,
         autoStartPauseUntilReady: true,
+        osdMessages: false,
         texthookerEnabled: false,
         aniskipEnabled: false,
         aniskipButtonKey: 'F8,\nF9',
@@ -218,6 +240,7 @@ test('buildPluginRuntimeScriptOptParts strips script-option delimiters from stri
       'subminer-auto_start=yes',
       'subminer-auto_start_visible_overlay=no',
       'subminer-auto_start_pause_until_ready=yes',
+      'subminer-osd_messages=no',
       'subminer-texthooker_enabled=no',
       'subminer-aniskip_enabled=no',
       'subminer-aniskip_button_key=F8 F9',