feat(desktop): port v0.11.4-v0.15.2 from Tauri to Electron + Discord-parity audio (v0.16.0)

Chronological port of every Tauri release commit (v0.11.4 -> v0.15.2)
into the Electron rebuild, plus Discord-style audio handling that goes
beyond the Tauri original.

Highlights:
  - All 17 Tauri release commits ported (audio fixes, custom notification
    sound, Discord-style chat UX, profile banner, changelog page,
    Discord-parity call UX, screen-share echo + re-watch UX, audio-loop
    fix).
  - Native napi-rs audio-loopback addon with WASAPI process-loopback:
      * EXCLUDE_TARGET_PROCESS_TREE for full-screen shares -> peers
        never hear themselves echoed back through the capture.
      * INCLUDE_TARGET_PROCESS_TREE for window shares -> only the
        picked window's audio is captured, not the whole OS mixer
        (Discord parity).
      * HWND -> PID resolution via Win32 GetWindowThreadProcessId.
  - Discord-style screen-source picker (thumbnail grid, screens vs
    apps tabs, live-refreshing thumbnails).
  - Hash routing fix for packaged builds (file:// can't resolve
    BrowserRouter paths).
  - Tauri sources removed (apps/desktop/src-tauri).

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

packages/db-types/src/index.ts

@@ -395,6 +395,7 @@ export type Database = {
         Row: {
           allow_dms_from_strangers: boolean
           avatar_url: string | null
+          banner_url: string | null
           banned: boolean
           blocked_from_inviting: boolean
           created_at: string
@@ -411,6 +412,7 @@ export type Database = {
         Insert: {
           allow_dms_from_strangers?: boolean
           avatar_url?: string | null
+          banner_url?: string | null
           banned?: boolean
           blocked_from_inviting?: boolean
           created_at?: string
@@ -427,6 +429,7 @@ export type Database = {
         Update: {
           allow_dms_from_strangers?: boolean
           avatar_url?: string | null
+          banner_url?: string | null
           banned?: boolean
           blocked_from_inviting?: boolean
           created_at?: string