Replace the three generic developer-oriented icons with mockup-faithful
custom SVGs (folder / bar-chart / pencil) tinted per Skill (warm orange
/ success green / violet) via semantic design tokens plus one arbitrary
hex for violet since no violet token exists in the design system.

Card visual switches from vertical card with description text to inline
pill (icon + title side by side, no description), matching the mockup's
light button style. Neutral chip border at rest, lifted border on hover.
Click behavior unchanged.

Home shell layout refines to match the #151 mockup: shift content down
via pt-[28vh], compact title→subtitle→pills rhythm, restore subtitle
with new copy "PawWork 可以帮你处理文件、分析信息、撰写内容并完成各类任务。"
and its English counterpart.

The upstream Icon component is kept in sidebar-items.tsx for the skill
badge (falls back to folder / status / pencil-line), so badge icons
differ from home for data-analysis during the PR #1 → PR #2 interval;
PR #2 removes the badge entirely.

Refs #151 (PR #1 commit 2 of 2).

Clicking a Skill card now sets a local selectedSkill signal inside
NewSessionView; it no longer calls session.create or navigate. The
composer placeholder switches to a Skill-specific copy via a new
branch in promptPlaceholder.

NewSessionView's composer prop is now a render-prop that receives a
ctx of { onModeChange, selectedSkill }. Ctx threads through
renderComposerRegion to SessionComposerRegion to PromptInput.
PromptInput derives the Skill placeholder from ctx directly; upstream
does not compute placeholder strings.

No preparation card: pill selected state + placeholder switch already
cover the feedback that a Skill is selected, and dropping the card
keeps the composer position stable through selection changes.

session-new-view.test.ts still exercises startPawworkSkillSession as a
standalone function (unchanged here); its assertions stay green. The
eventual rewrite lands in the cleanup commits. shell-frame-contract
test updated for the new renderComposerRegion signature.

Part of PawWork issue 151 Skill starter reshape.

In home mode, wrap the DockTray agent Select in a Show guard so it does
not render. Model selector, variant, WorkspaceChip, attachment, and Send
stay. Keyboard shortcuts (agent.cycle, mode.shell, mode.normal) still
work because only the visible chip is hidden; the underlying state is
untouched. Session composer is unchanged.

Plan referenced explicit shell/prompt-mode toggle buttons; the current
code exposes those only through command-palette entries + keybinds, so
there is nothing extra to hide.

Part of PawWork issue 151 Skill starter reshape.

Drop the session.skill badge rendering from sidebar-items. The
session.skill field on Session stays readable for legacy data
compatibility; the sidebar simply does not render it anymore. Removes
the getPawworkSkillMeta import, the skill createMemo, and the now-unused
language binding on SessionItemContent so the subsequent cleanup commit
can delete the getPawworkSkillMeta export without touching the sidebar
again.

Part of PawWork issue 151 Skill starter reshape.

For home sends (params.id undefined) the model/agent required guard no
longer fails when currentAgent is missing, and the effective agent
variable is forced to "build" regardless of the persisted global agent.
This applies to every home submission including typed custom slash
commands and shell; session sends keep requiring an agent and pass it
through verbatim. Global agent state is never mutated.

isNewSession was already computed below the guard; moved its assignment
above so the guard and the agent override share the same binding.

Part of PawWork issue 151 Skill starter reshape.

Thread selectedSkill from NewSessionView through SessionComposerRegion
and PromptInput into createPromptSubmit. Home submit with a selected
Skill now:

- allows empty-text send (Gate 1 on both server-side guard and the Send
  button disabled expression; the Enter-key path falls through to the
  relaxed server guard and needs no separate edit)
- overrides outgoing text to "/skill-name ..." or "/skill-name" (Gate 4)
- routes through promptAsync, never session.command (Gate 5; the single
  outgoingTextOverride field also suppresses sendFollowupDraft's slash
  detection, so no second flag is needed)
- skips prompt history entry when the user's text is empty (Gate 6)

Same outgoing text feeds both requestParts and optimisticParts so the
user's own message bubble shows the slash-prefixed text, per spec. The
editor state is never mutated; selectedSkill is local to NewSessionView
and survives submit, so no restore callback is needed.

Part of PawWork issue 151 Skill starter reshape.

Drop the now-unreferenced helpers, export, and tests left over from the
pre-reshape Skill starter:

- session-new-view-start.ts and session-new-view-command.ts (the old
  click-starts-session helpers; no callers after UI-3)
- e2e/sidebar/sidebar-pawwork.spec.ts (covered the badge removed in
  UI-5)
- getPawworkSkillMeta export from pawwork-skill-meta.ts (UI-5 removed
  the sidebar caller, UI-3 removed the home caller when the
  preparation card was dropped)
- session-new-view.test.ts (covered the deleted startPawworkSkillSession
  flow; the new createPromptSubmit Skill-aware path is exercised
  manually per the PR checklist and will get unit coverage in a
  follow-up PR)

pawwork-skill-meta.test.ts trimmed to a card-identity snapshot.

Combining the file deletion and the test trim into one commit avoids
a broken intermediate typecheck (tsgo -b compiles test files, so
dropping the export with the test still referencing it would fail the
gate).

Part of PawWork issue 151 Skill starter reshape.

In home mode, hide the top DockTray entirely and surface the model and
variant chips on the bottom bar immediately left of the Send button.
Session mode keeps the original tray (agent + model + variant up top,
only Send at the bottom).

Extract the model and variant chip JSX into two local renderers inside
PromptInput so home and session share one source of truth; home passes
the bottom-button motion memo as the chip trigger style, session keeps
the existing top-tray control style.

Also raises the composer scroll area min-height to 104px so the editor
does not feel cramped when empty.

Part of PawWork issue 151 Skill starter reshape.

Extract the outgoingTextOverride string assembly into a pure
buildHomeOverride helper and wire submit.ts's draft construction to
use it, so the (skill, user-text) -> "/skill …" contract can be
unit-tested without touching the full context-tree harness. Covers:

- no selected Skill returns undefined
- Skill-only send returns "/skill-name"
- whitespace-only user text is treated as empty
- Skill + user text trims and joins with a single space
- slash-like user text is kept verbatim; Gate 5's routing-bypass is
  the caller's job, not this helper's

Also extend placeholder.test.ts with the Skill branch introduced in
UI-3 plus its priority ordering (shell > comments > selectedSkill >
suggest > simple > normal).

This does not replace a full createPromptSubmit integration harness;
Gate 5 (slash bypass) and Gate 6 (history skip) are inline in
handleSubmit and remain covered by manual verification. A follow-up
PR can extract further pure helpers or build an SDK-mock harness.

Part of PawWork issue 151 Skill starter reshape.