Fix #28: Feature request: viewing mode

[JiwaniZakir]

Closes #28

Adds a view mode toggle to SessionPage in apps/web/src/routes/_app/session/$id.tsx that hides the message input bar for a distraction-free reading experience.

Changes

apps/web/src/routes/_app/session/$id.tsx — SessionPage function

• Added viewingMode boolean state (initialized to false) alongside existing state declarations near line 682.
• Refactored the bottom toolbar div (previously border-t border-border p-4 shrink-0 relative) into a conditional: when viewingMode is true, renders a minimal strip with only an "Exit view mode" button (IconEye + label, text-xs, right-aligned); when false, renders the full composer including FileMentionPopover, the input form, AgentSelect, and model controls inside a nested div.p-4.relative.
• Added a "View mode" button (IconEye, text-xs, text-muted-fg) inside the AgentSelect row that sets viewingMode to true.

Motivation

Users reading through past sessions were forced to scroll with the full message input bar occupying bottom space. The view mode collapses that entire panel, leaving only a small exit affordance so users can return to composing without a page reload or navigation.

Testing

1. Open any existing session with a message history.
2. Click the View mode button in the toolbar next to AgentSelect — confirm the composer, file mention popover, model selector, and send controls disappear.
3. Confirm the bottom bar shrinks to a single right-aligned Exit view mode button.
4. Click Exit view mode — confirm the full composer is restored and functional (typing, sending a message).
5. Verify no layout shift or overflow occurs in the message list when toggling between modes at various viewport widths.

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This PR was created with AI assistance (Claude). The changes were reviewed by quality gates and a critic model before submission.

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[JiwaniZakir]

The conditional rendering approach works, but consider persisting viewingMode to localStorage so the preference survives navigation — users reading long sessions will likely want it to stay on when they switch between sessions. Also, IconEye is being used for both entering and exiting view mode, which could be confusing; using IconEyeOff for the "Exit view mode" button would make the toggle state clearer.