feat: tangent - interactive chips in tangent chat

[maxy-shpfy]

Description

Adds clickable entity:// and component:// chip rendering to the embedded AI chat. When the AI references a pipeline entity (task, input, or output) or a component in a message, the link now renders as an interactive chip instead of a plain anchor.

Clicking an entity chip activates the workarea pipeline tab that owns the entity and focuses it on the canvas. The resolution logic first tries to match by $id, then falls back to matching by label name to handle stale IDs from prior sessions. Component chips hydrate by digest, using a context-provided map when available and falling back to a service call.

Key additions:

• resolveChatEntity — resolves an entity ID/label pair against a live ComponentSpec tree, including subgraph traversal and label-based fallback for drifted IDs.
• chatEntityKindFromId — infers entity kind from the ID prefix for icon rendering before a spec is loaded.
• entityIcon — extracted shared icon lookup for task, input, output, and unknown kinds.
• chatAnchorProtocols — AnchorProtocolMap wiring entity:// to EntityAnchor and component:// to ComponentAnchor, passed into the embedded <Chat> component.
• ChatEntityRevealContext — React context that carries the revealEntity callback from TangentProjectStore down to the anchor renderers.
• ComponentChipFromContext / ComponentRefsContext — extracted from renderMarkdown into their own module so they can be shared between the markdown renderer and the new anchor protocol handler.
• TangentProjectStore.revealEntity — iterates open pipeline tabs, finds the one whose live spec resolves the entity, activates it, and delegates focus to navigateToEntity.

Screenshots (if applicable)

Screen Recording 2026-09-18 at 12.36.30 PM.mov (uploaded via Graphite)

Test Instructions

1. Open a project with at least two pipeline tabs.
2. Start a chat session and trigger a response that includes entity:// chip links referencing tasks or inputs in one of the pipelines.
3. Click an entity chip — the owning pipeline tab should become active and the referenced entity should be focused on the canvas.
4. Verify that chips with stale IDs (where the label still matches a live entity name) also resolve correctly.
5. Verify that component:// chips render and hydrate correctly by digest.
6. Confirm that entity chips with no matching open pipeline tab are rendered but inert (no crash on click).

Additional Comments

ComponentChipFromContext and ComponentRefsContext were moved out of renderMarkdown.tsx into their own file to allow reuse by the new anchor protocol handler without circular dependencies.

[github-actions]

🎩 Preview

A preview build has been created at: 09-17-feat_tangent_-_interactive_chips_in_tangent_chat/9aff02f

[maxy-shpfy]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• feat: create a project from a tile in the grid #2735 : 3 dependent PRs (#2736 , #2737 , #2738 )
• feat: projects dashboard #2734
• chore: tangent - annotate runs submission to projectid #2758
• fix: tangent - proper debug sequence system prompt #2757
• fix: tangent - quick run button from mini content window #2744
• fix: tangent - remote agent send delta immediately #2743
• fix: tangent - mint proper authorization with tangent #2742
• feat: tangent - debug in tangent sequence #2741
• chore: add autolayout tool #2740
• feat: tangent - resource management via document entity #2733
• feat: tangent - interactive chips in tangent chat #2732 👈 (View in Graphite)
• chore: save id stack to replay ids on reloads #2731
• refactor: tangent - migrate tangetproectcontext onto mobx #2730
• feat: tangent - keep track of open tabs while switching sessions inside project #2729
• feat: tangent - remote agent for runview and editor #2728
• refactor: tangent - structured workarea target #2727
• feat: tangent - embedded pipeline run view #2726
• feat: tangent - embedded pipeline editor #2725
• feat: tangent - dynamic workarea remote tools #2724
• feat: tangent - resources management in project view #2723
• feat: tangent project view page #2722
• feat: workspaces and projects service #2720
• chore: api client for workspaces and projects #2719
• master

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