feat(ui): motion, shell layout and unified sidebar foundation

[freebuff-web]

Draft: additive new-shell foundation

This branch now contains only the experimental Herdr TUI shell foundation:

• time-based motion primitives
• responsive shell geometry
• unified Workspaces / Agents / Attention sidebar models
• compact tabs, Fleet Ops, launcher and settings modules
• shell-focused unit and integration test sources

The active Herdr runtime, AppState, renderer, configuration and mouse/input paths are unchanged from main. The new modules are intentionally not wired into production yet.

Scope cleanup completed

Removed from this branch:

• incomplete runtime/render/input integration
• Cursor agents and skills
• CI and CI-heavy workflow policy
• quality-CI documentation
• CI path classification
• downstream/maintainer CI policy text
• standalone tarpaulin configuration
• temporary CI trigger and unrelated update-manifest drift

Required before integration

• use one authoritative ShellLayout for render and hit testing
• distinguish handled-without-action from unhandled mouse input
• replace the incomplete layout hash/dirty flag with explicit invalidation
• start/retarget transitions only on target changes
• connect animation wakeups to the event loop with a deterministic clock in tests
• retain the real terminal renderer during integration
• allocate and test all tab/new-tab/scroll hit regions
• render all launcher rows
• define reachable responsive breakpoints
• resolve applicable blocking review threads when integration resumes

This PR remains draft while CI validates the isolated foundation.

Greptile Summary

This change adds an experimental terminal shell foundation with responsive layout, shared navigation models, Fleet Ops, launcher, settings, motion primitives, and expanded update-manifest coverage. It also changes terminal mouse and URL-click input handling.

A modified URL click can leave a mouse-reporting terminal pane with an unmatched drag or button-release event: the host consumes the Ctrl-click press but does not suppress the rest of that gesture.

T-Rex validation blocked

• Missing tool: zig. The focused Rust tests could not compile because build.rs:77 invokes zig build and the zig executable is unavailable. No assertions ran. Configure VMs

Confidence Score: 3/5

T-Rex Logs

What T-Rex did

• T-Rex identified the pre-change test source pending-url-click-01-before.rs as the prior test that consumed a handled URL click's matching release.
• T-Rex identified the after-change test source pending-url-click-02-after.rs as the test that exercises the reported drag-and-release failure path.
• T-Rex recorded the execution blocker where both Cargo outputs report 'failed to execute zig build' with 'No such file or directory', preventing any test assertions from running.

_{Ran code and verified through T-Rex}

Prompt To Fix All With AI

### Issue 1
src/app/mod.rs:129
**URL gesture release leaks to pane**

When a user Ctrl-clicks a URL in a mouse-reporting terminal, the host consumes only the initial left-button down event because `pending_url_click` is never set or consumed. The matching drag or release event then reaches the pane without a preceding down event, breaking the terminal application's mouse-button state.

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For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

_{Reviews (2): Last reviewed commit: "chore(ui): remove temporary runtime inte..." | Re-trigger Greptile}

Greptile also left 1 inline comment on this PR.

Context used:

• Context used - Focking gretig zijn en niet stoppen tot perfectie.... (source)

[github-actions]

Quality remediation resolved

CI is green again for PR #79 at 214948a89978. This sticky brief is kept for history; the quality-remediation label was removed.

[qodo-code-review]

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[greptile-apps]

URL gesture release leaks to pane

When a user Ctrl-clicks a URL in a mouse-reporting terminal, the host consumes only the initial left-button down event because pending_url_click is never set or consumed. The matching drag or release event then reaches the pane without a preceding down event, breaking the terminal application's mouse-button state.

Context Used: Focking gretig zijn en niet stoppen tot perfectie.... (source)

Prompt To Fix With AI

This is a comment left during a code review.
Path: src/app/mod.rs
Line: 129

Comment:
**URL gesture release leaks to pane**

When a user Ctrl-clicks a URL in a mouse-reporting terminal, the host consumes only the initial left-button down event because `pending_url_click` is never set or consumed. The matching drag or release event then reaches the pane without a preceding down event, breaking the terminal application's mouse-button state.

**Context Used:** Focking gretig zijn en niet stoppen tot perfectie.... ([source](https://app.greptile.com/review/custom-context?memory=instruction-0))

---

For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.