New web UI with iPhone web app

Redesigned status, log, tag generator and settings pages: spool rings in
filament colour, live job card (progress and time left read from CC2
Control's /api/printer while a job runs), log page with filters, iOS-style
settings with a write/dry-run switch. On phones: bottom tab bar, printer
switcher, slot details in a bottom sheet. Dark mode follows the system.
Web app manifest and home screen icons for "Add to Home Screen".

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014GcEk5tkfFSYD6NTF66NkC

tests/fakes.py

@@ -48,6 +48,7 @@ class FakeCC2:
         self.slots[4]["printer"] = None
         self.library: list[dict] = []
         self.job = {"active": False}
+        self.print_info = {"machine": {"progress": 40}, "print": {"current_layer": 12, "total_layers": 30, "remaining": 600}}
         self.log: list[dict] = []  # newest first, as CC2 Control lists it
         self.calls: list[tuple] = []
         self.fail = False
@@ -64,6 +65,10 @@ class FakeCC2:
         self._check()
         return copy.deepcopy(self.spools_json())
 
+    def printer(self):
+        self._check()
+        return copy.deepcopy(self.print_info)
+
     def canvas(self):
         self._check()
         return {}