Restyle Home and Chat after OmniTavern's classic light/dark theme

[Cassiur]

User problem

The app looked like an untouched Material Components template: default purple accent, lavender-tinted background, floating rounded cards, round letter avatars in muddy hash-derived colors, and a 34sp ‹ text glyph as the back button. It didn't read as a current, polished chat app.

This restyles the two most-used screens (Home and Chat) after OmniTavern's built-in "经典白 / 经典黑" (classic light / classic dark) themes. Color values come from its theme-store.js presets rather than being eyeballed.

Changes

• Palette (values/colors.xml, values-night/colors.xml): cool-gray #F4F5F6 page, white surfaces, slate text (#0F172A / #64748B), #199AFF accent; GitHub-dark-style night palette (#171B20 page, #2F81F7 accent). Adds a divider token.
• Home
  • Character cards → flat list rows with a hairline divider inset past the avatar (bg_character_card.xml is now a layer-list; elevation and card margins removed).
  • Avatars: circles → 48dp rounded squares (12dp). CharacterAdapter maps the stored, muted hash-derived accent_color onto a saturated palette at render time; database values are unchanged.
  • Header title 28sp bold → 22sp medium; search box is a bordered white pill.
• Chat
  • Assistant bubble drops its 1dp stroke in favor of elevation="1dp"; the message container gets 2dp padding so the shadow isn't clipped.
  • Back button: TextView with ‹ → ImageButton with the existing chevron vector (the Java side only calls setOnClickListener, so the type change is safe). Adds a navigate_back content description.
  • Hairline dividers under the header and above the composer; send button corner radius 22dp.
• Bug fix (themes.xml): colorSecondary was never set, so the create-character FAB rendered in Material's default teal #03DAC6. It now follows the accent.
• bg_agent_card.xml no longer hardcodes a #F0EAF8 lavender gradient; badge/tag radii tightened to 8dp.
• CHANGELOG.md: Unreleased entry.

Other screens pick up the new palette through the shared color tokens but keep their existing layouts. Rolling the structural changes (e.g. the vector back button) out to them is left for a follow-up.

Verification

• testDebugUnitTest
• lintDebug
• assembleDebug
• Tested on an emulator or device when UI/data behavior changed — not done: the emulator can't start on the dev machine (missing Windows hypervisor driver). Please install the debug APK and check shadows, divider insets, and dark mode on a device before merging.
• No keys, chats, cards, databases, or user media are included
• CHANGELOG.md and relevant docs are updated

Screenshots

No device screenshots yet (see above). The before/after was reviewed with an HTML mockup built from the real layout XML and hex values; device screenshots should be added here after an on-device check. docs/images/home.png and chat.png in the README still show the old look and will need refreshing too.

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