feat: Claude session profiles + light UI mode

[ivandobskygithub]

Summary

Adds Claude session profiles — named bundles of env vars (e.g. ANTHROPIC_BASE_URL, ANTHROPIC_AUTH_TOKEN) merged into a session's pty env at spawn time. Lets you rapidly switch inference backends (Anthropic → DeepSeek → GLM) per session without restarting the app.

Also adds a light UI mode + two light terminal themes.

Stacked on top of #1 (chore/upstream-sync). Merge that first.

Profiles

Storage: <userData>/profiles.json (atomic tmp+rename). Plain JSON — values are either literals or references like \$DEEPSEEK_API_KEY / \${DEEPSEEK_API_KEY} resolved against the host process env at spawn time. Unresolved refs are dropped, not passed through literally — so missing host env vars never silently leak fake secrets into Claude.

Selection precedence at spawn:

1. sessionOptions.profileId if set ('none' = pass-through, ignore default)
2. Global default profile (defaultProfileId in profiles.json)
3. No profile

UI:

• New-session popover now lists each profile as a launch option (default badge marked)
• "Manage profiles…" entry opens a modal: list / create / edit / delete / set-default
• Editor enforces env-name regex, shows live env ref vs literal indicator per value, suggests ANTHROPIC_BASE_URL + ANTHROPIC_AUTH_TOKEN for new profiles
• Configure dialog gets a profile dropdown (Default / No profile / each saved profile)

Example profile (DeepSeek):

{
  \"id\": \"deepseek\",
  \"name\": \"DeepSeek\",
  \"env\": {
    \"ANTHROPIC_BASE_URL\": \"https://api.deepseek.com/anthropic\",
    \"ANTHROPIC_AUTH_TOKEN\": \"\$DEEPSEEK_API_KEY\",
    \"ANTHROPIC_MODEL\": \"deepseek-chat\"
  }
}

User sets DEEPSEEK_API_KEY once via setx (Windows) / shell rc (mac/linux); profile references it. Switching to GLM or anything else is just a new profile.

Light UI mode

• Body class theme-light toggled via Global Settings → "Light UI Mode". Persisted in localStorage, applied at app load (avoids dark-flash).
• Two new terminal themes added: Light and Solarized Light.
• Sidebar, terminal header, dialogs, popovers, inputs, and profile UI all have light overrides.

Test plan

• npm test → 145/145 passing (added 14 unit tests for profiles)
• Create a DeepSeek profile, set as default, launch a session — terminal env should have correct base URL + resolved token
• Launch with explicit profile via popover → that profile's env wins
• Launch with "No profile" via Configure dialog → no profile env applied even though default exists
• Set value to `$NONEXISTENT_VAR` → log shows it dropped, not passed through
• Toggle Light UI Mode → sidebar / dialogs flip to light; terminal theme picker now offers Light / Solarized Light
• Restart app → light mode persists

Files

File	Change
profiles.js	NEW — main process module: load/save/resolve/IPC
test/profiles.test.js	NEW — 14 unit tests covering validation, env resolution, persistence
public/profiles-panel.js	NEW — profile manager + editor modals
preload.js	Expose window.api.profiles.{list,save,delete,setDefault}
main.js	Wire profilesModule.init; merge resolved profile env into ptyEnv at session spawn
public/dialogs.js	Profile entries in popover + dropdown in Configure dialog
public/settings-panel.js	"Light UI Mode" toggle in Global Settings
public/terminal-themes.js	Add light + solarizedLight terminal themes
public/style.css	Profile UI styling + body.theme-light overrides
public/app.js	Apply persisted light mode on load
public/index.html	Load profiles-panel.js

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