Polish shared Settings controls, Profile, Calendar and AI

[Maneek21]

Settings controls used nearly invisible borders and inconsistent spacing and type sizes. Add Settings-scoped control contrast, field sizing, focus and hover treatment, plus clearer section navigation.

Polish Profile, Calendar connections and AI configuration with aligned headings and content widths. Give Profile's main form more room, strengthen its save action, and increase Calendar/AI body text for readability. Existing forms stay mounted during section switching.

Validation: web typecheck, full web lint and focused checks of the final Calendar/AI changes; rendered desktop/mobile inspection of Profile, Calendar and AI, mobile Apps, Profile draft retention, Calendar section switching and all four AI sections at 390px. Desktop navigation covered workspace and administration Settings routes. Fixture UI evidence does not certify persistence, live connections or complete role/mobile coverage. Shared styling applies across Settings; this does not claim every individual page is fully redesigned.

Stacked on #324. Keep unmerged for user review. No auto-merge.

Follow-up review: three passes covered 18 top-level Settings routes. Fixed the missing mobile Task templates title, squeezed Task rules and Service API actions, and tag-creation controls extending offscreen. Verified the tag fix at 320/390px, colour selection semantics, and all four corrected screenshots. Typecheck, focused lint and three navigation tests passed. Exact coverage and remaining gaps are recorded in docs/superpowers/audits/2026-09-09-settings-review-passes.md.

[Maneek21]

All commits in this Settings polish stack are incorporated in merged PR #323 (master 7c2e409). The consolidated candidate passed every required CI and security check, including real token creation/revocation and desktop/mobile browser smoke. Closing this stacked PR as incorporated.