feat: add Kiro IDE to editor picker

[JustaCube]

What Changed

1. Kiro IDE in "Open in" editor picker

• Added kiro entry to the EDITORS array in packages/contracts/src/editor.ts
• Added KiroIcon SVG component using the official Kiro brand logo (#9046FF purple)
• Added Kiro option to the OpenInPicker dropdown in the web UI
• Added --goto flag support for Kiro (VS Code-based, supports line:column navigation)

2. Codex rate limits display banner

• Typed AccountRateLimitsUpdatedPayload with structured RateLimitsInfo schema (replaces Schema.Unknown)
• Surfaced account.rate-limits.updated as a thread activity in ProviderRuntimeIngestion
• Added deriveLatestRateLimits helper in session-logic.ts to extract latest rate limits from thread activities
• Added RateLimitsBanner component with color-coded progress bars and reset time tooltips
• Wired into ChatView between ProviderHealthBanner and ThreadErrorBanner

UI Changes

Editor picker:

• Before: Cursor, VS Code, Zed, Explorer
• After: Cursor, VS Code, Kiro, Zed, Explorer

Rate limits banner (appears below header after Codex reports usage):

• Shows primary (5h) and secondary (7d) windows as compact progress bars
• Color-coded: green → amber → red as usage increases
• Hover tooltip shows remaining % and reset countdown

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes

Note

Add Kiro IDE to the Open in editor picker

• Adds { id: 'kiro', label: 'Kiro', command: 'kiro' } to the EDITORS constant in editor.ts
• Adds a KiroIcon SVG component (purple theme) in Icons.tsx and surfaces a 'Kiro' option in OpenInPicker.tsx when kiro is present in availableEditors
• Extends shouldUseGotoFlag in open.ts to return true for editorId === 'kiro', matching the existing behavior for cursor and vscode

^{Macroscope summarized d1e16e1.}

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[juliusmarminge]

separate PRs please

[JustaCube]

@juliusmarminge Done!

[binbandit]

LGTM