docs(wails): move the prose onto v3 and record Phase 7

CLAUDE.md gains a Packaging section for the four Taskfile facts the
recipes just needed — wails3 on PATH by bare name, no -ldflags on
`wails3 build`, bin/ not build/bin/, and bundling as its own step —
plus how build/'s platform metadata generates from build/config.yml and
what that refresh overwrites.

Its lifecycle, bindings, harness, events and CI sections were still
describing v2. The events one matters most: the rule to emit through
events.Emit survives, but its justification is now the weaker one, and
saying so is the point of the migration. v2's runtime.EventsEmit
log.Fatalf'd on any context not carrying the runtime; v3's emit takes
no context at all, so what is left to pin is that one emit path is what
lets emitStatus drop an unchanged payload for every caller at once.

README told a contributor to `go install wails/v2/cmd/wails` and
apt-get libgtk-3-dev/libwebkit2gtk-4.1-dev; the CLI is vendored and the
stack is GTK4 + WebKitGTK 6.0. Two comments claiming Xvfb and one
claiming frontend/wailsjs go with them.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UDCbcCZQepnpSQYJ6SxxZm

.gitea/workflows/ci.yml

@@ -171,7 +171,7 @@ jobs:
         working-directory: /src
         run: make ui-test
 
-      # frontend/wailsjs is generated by `wails`, not by `go generate`,
+      # frontend/bindings is generated by `wails3`, not by `go generate`,
       # so the codegen pre-commit hook does not cover it.
       - name: Bindings are current
         working-directory: /src
@@ -184,7 +184,9 @@ jobs:
         run: make skill-check
 
   # ---------------------------------------------------------------- #
-  # Job 2: the real app, under a virtual display.                     #
+  # Job 2: the real app, headless.  v3's `-tags server` needs no       #
+  # display, so the Xvfb this job used to wrap everything in is gone.  #
+  # `dbus-run-session` stays, for MPRIS.                               #
   # ---------------------------------------------------------------- #
   e2e:
     runs-on: ubuntu-latest