feat(desktop): surface /model in the slash palette

[Kyzcreig]

Un-hide /model in the desktop slash registry so it appears in the popover/completions; picking it opens the model picker overlay, typed args still exec on the backend.

Upstream PR: NousResearch#64464. Rebased onto current fork/main (post-#328 picker changes; no overlap — #328 touches picker contents, this touches palette visibility).

Tests: desktop-slash-commands 16/16, prompt-actions+model-menu 55/55, tsc clean. Live E2E proven on both Macs (CDP-driven keystrokes → popover → picker overlay).

[greptile-apps]

Greptile Summary

This PR un-hides /model in the desktop slash command registry by removing hidden: true from its spec, so it now appears in the slash palette popover alongside /resume (which has always been surfaced the same way). The picker-surface dispatch behavior and typed-arg execution path are unchanged.

• desktop-slash-commands.ts: Single-property removal — hidden: true is dropped from the /model spec; everything else (surface kind, description, execution behavior) stays identical.
• desktop-slash-commands.test.ts: Removes the now-incorrect negative assertion that /model is hidden, and adds /model to the expected output of the filterDesktopCommandsCatalog test to reflect its new visibility.

Confidence Score: 4/5

Safe to merge — the change is a single-property removal that aligns /model with how /resume is already surfaced, with no impact on execution logic.

The production code change itself is minimal and correct. The test file removes the negative assertion but omits a direct positive assertion, and leaves a stale comment that now says the opposite of what is true. Neither issue affects runtime behavior, but they weaken the test self-documentation going forward.

The test file (desktop-slash-commands.test.ts) has a stale comment and a missing explicit positive assertion worth tidying before this pattern is copied for future commands.

Important Files Changed

Filename	Overview
apps/desktop/src/lib/desktop-slash-commands.ts	Removes hidden: true from the /model spec — one-property change that makes it visible in the palette, consistent with how /resume is already handled.
apps/desktop/src/lib/desktop-slash-commands.test.ts	Removes the negative /model suggestion assertion and adds /model to the catalog filter expectation; missing an explicit positive isDesktopSlashSuggestion('/model') === true assertion, and leaves a stale comment implying /resume shows in the popover 'unlike /model'.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[User types /model in input] --> B{isDesktopSlashSuggestion?}
    B -- "Before PR: hidden: true → false" --> C[Not shown in palette]
    B -- "After PR: hidden removed → true" --> D[Shown in slash palette]
    D --> E{User picks /model}
    E --> F{Has typed arg?}
    F -- "e.g. /model sonnet" --> G[Picker resolves arg directly]
    F -- "bare /model" --> H[Opens model picker overlay]
    C --> I[Only reachable via status-bar chrome]

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%%{init: {'theme': 'base', 'themeVariables': {"darkMode": true, "background": "#0d1117", "primaryColor": "#21262d", "primaryTextColor": "#e6edf3", "primaryBorderColor": "#8b949e", "lineColor": "#8b949e", "textColor": "#e6edf3", "edgeLabelBackground": "#161b22", "actorBkg": "#21262d", "actorBorder": "#8b949e", "actorTextColor": "#e6edf3", "actorLineColor": "#8b949e", "signalColor": "#8b949e", "signalTextColor": "#e6edf3", "noteBkgColor": "#373320", "noteBorderColor": "#d4a72c", "noteTextColor": "#f0e6c0", "labelBoxBkgColor": "#21262d", "labelBoxBorderColor": "#8b949e", "labelTextColor": "#e6edf3", "loopTextColor": "#e6edf3", "activationBkgColor": "#30363d", "activationBorderColor": "#8b949e"}}}%%
flowchart TD
    A[User types /model in input] --> B{isDesktopSlashSuggestion?}
    B -- "Before PR: hidden: true → false" --> C[Not shown in palette]
    B -- "After PR: hidden removed → true" --> D[Shown in slash palette]
    D --> E{User picks /model}
    E --> F{Has typed arg?}
    F -- "e.g. /model sonnet" --> G[Picker resolves arg directly]
    F -- "bare /model" --> H[Opens model picker overlay]
    C --> I[Only reachable via status-bar chrome]

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