feat: instant feedback button — creates Gitea issues with auto-labels

iOS:
- Subtle floating feedback button (bottom-left, speech bubble icon)
- Quick sheet: type → send → auto-creates Gitea issue
- Shows checkmark on success, auto-dismisses
- No friction — tap, type, done

Gateway:
- POST /api/feedback endpoint
- Auto-labels: bug/feature/enhancement + ios/web + fitness/brain/reader/podcasts
- Keyword detection for label assignment
- Creates issue via Gitea API with user name and source

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ios/Platform/Platform.xcodeproj/project.pbxproj

@@ -39,6 +39,7 @@
 		A10030 /* Color+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = B10030; };
 		A10031 /* Date+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = B10031; };
 		A10032 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = C10001; };
+		A10033 /* FeedbackView.swift in Sources */ = {isa = PBXBuildFile; fileRef = B10034; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
@@ -74,6 +75,7 @@
 		B10030 /* Color+Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Color+Extensions.swift"; sourceTree = "<group>"; };
 		B10031 /* Date+Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Date+Extensions.swift"; sourceTree = "<group>"; };
 		B10033 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		B10034 /* FeedbackView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FeedbackView.swift; sourceTree = "<group>"; };
 		C10001 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 		D10001 /* Platform.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Platform.app; sourceTree = BUILT_PRODUCTS_DIR; };
 /* End PBXFileReference section */
@@ -128,6 +130,7 @@
 				F10006 /* Home */,
 				F10007 /* Fitness */,
 				F10014 /* Assistant */,
+				F10020 /* Feedback */,
 			);
 			path = Features;
 			sourceTree = "<group>";
@@ -221,6 +224,14 @@
 			path = Assistant;
 			sourceTree = "<group>";
 		};
+		F10020 /* Feedback */ = {
+			isa = PBXGroup;
+			children = (
+				B10034 /* FeedbackView.swift */,
+			);
+			path = Feedback;
+			sourceTree = "<group>";
+		};
 		F10015 /* Shared */ = {
 			isa = PBXGroup;
 			children = (
@@ -357,6 +368,7 @@
 				A10029 /* LoadingView.swift in Sources */,
 				A10030 /* Color+Extensions.swift in Sources */,
 				A10031 /* Date+Extensions.swift in Sources */,
+				A10033 /* FeedbackView.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};