chore: remove all source code comments and internal artifacts

Strip every comment from the source (parsed with the TypeScript compiler so
strings, template literals, regex literals and JSX are never touched), and drop
internal/working artifacts that do not belong in the public repository
(design mockups, internal analysis docs, a stray backup file and an old log).
No functional change: build is green, the full test suite passes.

tests/desktop-rename-log.test.ts

@@ -24,7 +24,6 @@ afterEach(() => {
     try {
       fs.rmSync(dir, { recursive: true, force: true });
     } catch {
-      // ignore
     }
   }
   createdTmpDirs.length = 0;
@@ -50,8 +49,6 @@ describe("desktop-rename-log", () => {
   });
 
   it("self-heals: recreates the whole Downloader-Log FOLDER and file if it is deleted mid-session", () => {
-    // Genau die User-Anforderung: Ordner zur Laufzeit geloescht -> beim naechsten
-    // Rename automatisch wieder da, selbst wenn das Programm offen ist.
     const desktop = tmpDesktop();
     initDesktopRenameLog(desktop);
     const logPath = getDesktopRenameLogPath() as string;
@@ -60,7 +57,6 @@ describe("desktop-rename-log", () => {
     fs.rmSync(path.join(desktop, "Downloader-Log"), { recursive: true, force: true });
     expect(fs.existsSync(logPath)).toBe(false);
 
-    // Naechster Vorgang muss Ordner UND Datei (mit Header) selbstheilend neu anlegen.
     logDesktopRename("INFO", "ZeileB");
     expect(fs.existsSync(path.join(desktop, "Downloader-Log"))).toBe(true);
     expect(fs.existsSync(logPath)).toBe(true);
@@ -80,7 +76,7 @@ describe("desktop-rename-log", () => {
     const dir = tmpDesktop();
     const source = path.join(dir, "scn-xyz.part1.rar");
     const target = path.join(dir, "Movie.2024.German.1080p.part1.rar");
-    fs.writeFileSync(target, "data"); // Post-Rename-Zustand: Ziel da, Quelle weg.
+    fs.writeFileSync(target, "data");
 
     const v = verifyRename(source, target);
     expect(v.ok).toBe(true);
@@ -102,7 +98,6 @@ describe("desktop-rename-log", () => {
   });
 
   it("verifyRename: FAILS (half-done move) when the source still exists next to the target", () => {
-    // EXDEV-Copy gelang, aber rm(source) schlug fehl -> Ziel da, Quelle auch noch.
     const dir = tmpDesktop();
     const source = path.join(dir, "src.rar");
     const target = path.join(dir, "dst.rar");