Simplify Studio navigation and page titles

Traceability

• Spec ID: studio-remove-inputs
• Status: Implemented

Intent

Remove the Inputs page and redundant project label preceding every page title, as requested by the maintainer.

Acceptance Scenarios

• AC-1: Navigation offers six views without Inputs; old Inputs routes fall back to Sessions.
• AC-2: All page headers show only the view title; project selection remains available in the sidebar.
• AC-3: Remove Inputs component, translations, styles, and dedicated GET endpoint; preserve shared input evidence used by intent correlation.
• AC-4: Shell navigation, keyboard focus, and bounded layout work at wide, compact, and narrow sizes.

Non-goals

Changing shared intent correlation contracts, release metadata, or unrelated in-progress work.

Plan and Tasks

Remove page ownership and update existing navigation tests. Build, run focused unit and browser checks, and inspect screenshots.

Test and Review Evidence

AC-1–AC-3: focused Studio unit tests: 76 passed; TypeScript check passed. AC-4: project-shell and language Playwright suites: 10 passed, including keyboard focus, console errors, overflow and screenshots at 1440, 1024 and 390 pixels. Doc link tests: 8 passed; routing graph regenerated without changes. Existing preview /health and /canvas-module.js return HTTP 200 (new preview launch found the port already occupied). Main risk is stale navigation expectations and accidental removal of shared evidence. AI implementation: Codex. Existing unstaged changes are preserved; no commit requested.