fix: correct relative imports after component reorganization

Fixed import paths for 43 components moved into features/ directories.
Key fixes:
- api/, types/, hooks/, state/, utils/ imports need ../../../ from features/*/
- components/ imports need ../../ from features/*/
- Cross-feature imports use relative paths (e.g., ../tool/tools-bottom-sheet)
- app-shell.tsx updated to import from features/ subdirectories

Frontend typecheck now passes except for one pre-existing error:
xterm-addon-webgl missing type declarations.

Quality gates: ruff passed on backend, py_compile passed on all backend files.

apps/web/src/components/features/session/session-card.tsx

@@ -1,9 +1,9 @@
 import { useState } from "react";
-import type { Session } from "../api/sessions";
-import { Icon } from "./icon";
-import { useMobileViewport } from "../hooks/use-mobile-viewport";
-import { MobileActionSheet } from "./mobile-action-sheet";
-import type { IconName } from "./icon";
+import type { Session } from "../../../api/sessions";
+import { Icon } from "../../icon";
+import { useMobileViewport } from "../../../hooks/use-mobile-viewport";
+import { MobileActionSheet } from "../mobile/mobile-action-sheet";
+import type { IconName } from "../../icon";
 
 export interface SessionCardProps {
 	session: Session;