feat(overlay): add in-app changelog modal

- Add a changelog modal opened from tray "View Changelog" or the update notification's "What's New" button; renders in-player or in its own window like the help modal
- Fetch changelog from the newest published release so newer-than-installed notes are visible, falling back to the bundled CHANGELOG.md on failure
- Group versions by minor line (current expanded, older folded), badge the installed version, tag newer ones "New"
- Support J/K/arrow navigation, Enter to fold/unfold, R to refetch, Esc to close
- Add changelog parsing/semver-compare utils and changelog IPC channel/runtime; bundle CHANGELOG.md into packaged builds
- Replace release/release-notes.md with changes/changelog-modal.md changeset entry

src/main/runtime/tray-main-deps.ts

@@ -29,6 +29,7 @@ export function createBuildTrayMenuTemplateMainDepsHandler<TMenuItem>(deps: {
   buildTrayMenuTemplateRuntime: (handlers: {
     platform?: string;
     openSessionHelp: () => void;
+    openChangelog: () => void;
     openTexthookerInBrowser: () => void;
     showTexthookerPage: boolean;
     openFirstRunSetup: () => void;
@@ -50,6 +51,7 @@ export function createBuildTrayMenuTemplateMainDepsHandler<TMenuItem>(deps: {
   initializeOverlayRuntime: () => void;
   isOverlayRuntimeInitialized: () => boolean;
   openSessionHelpModal: () => void;
+  openChangelogModal: () => void;
   openTexthookerInBrowser: () => void;
   showTexthookerPage: () => boolean;
   showFirstRunSetup: () => boolean;
@@ -74,6 +76,7 @@ export function createBuildTrayMenuTemplateMainDepsHandler<TMenuItem>(deps: {
     initializeOverlayRuntime: deps.initializeOverlayRuntime,
     isOverlayRuntimeInitialized: deps.isOverlayRuntimeInitialized,
     openSessionHelpModal: deps.openSessionHelpModal,
+    openChangelogModal: deps.openChangelogModal,
     openTexthookerInBrowser: deps.openTexthookerInBrowser,
     showTexthookerPage: deps.showTexthookerPage,
     showFirstRunSetup: deps.showFirstRunSetup,