Feat/narrow sidebar adaptivity

[luoxuanzao]

Summary

• Composer narrow-sidebar adaptivity: context chips collapse behind a "+N more" pill when the context row is too narrow (clicking the pill toggles wrapped expand/collapse), and the toolbar wraps instead of clipping.
• Permission mode and model selector dropdowns now anchor to the full toolbar row so they shrink to fit the sidebar instead of overflowing and being clipped; long model names are ellipsized and the runtime status banner scales with the panel width.

Needed because after the 1.0.4 context-chips redesign, narrow sidebars showed clipped chips and dropdowns spilling outside the sidebar.

Verification

• npm run typecheck
• npm run lint
• npm run test (135 suites / 3200 tests, incl. 11 new overflow-controller tests)
• npm run build
• npm run release:check
• npm run audit:prod
• Tested affected qodercli behavior against a real CLI when applicable (manually verified in the testObsidian vault: chip collapse on narrow sidebar, dropdown shrinking, full-width restore)

Safety

• No credentials, private vault content, internal URLs, or personal paths are included
• User-visible changes are documented in CHANGELOG.md