[WIP] Implement the plan outlined in implementation plan

[Copilot]

• Phase 0 – Fix coordinate misalignment (remove FB_WIDTH/FB_HEIGHT macros, add font_w/font_h to fb_t, use runtime dims in all views)
• Phase 1 – Scaffolding: remove compose view, rename login_view → auth_view, replace VIEW_LOGIN/VIEW_COMPOSE with VIEW_AUTH_WAIT, add paths.h/cpp, remove compose state from app_state_t
• Phase 2 – Credential file login: rewrite auth view as static instructions, implement login.txt parsing, update app_init() flow
• Phase 3 – Like & repost interaction: add viewer_like/viewer_repost to Post, add like/repost API methods to AtprotoClient, update feed/thread views with tappable ♡/⟳ and optimistic toggle
• Phase 3.5 – Dual image toggles: replace single images_enabled with profile_images_enabled + embed_images_enabled, two rows in settings, update feed/thread views
• Phase 4 – Input improvements: add TOUCH_SWIPE_* / TOUCH_LONG_PRESS events, implement swipe detection, update scroll handling in feed/thread
• Phase 5 – Framebuffer: add fb_mark_dirty()/fb_flush(), fix async image redraw to call *_view_draw() directly (not app_switch_view)
• Phase 5.5 – Bug fixes: JWT refresh (B4), thread recursion depth (B5), font buffer overflow (B9), disk cache eviction (B7), LRU cache (B8), repost attribution (B11), hash collision (B16)
• Phase 6 – Cleanup: update README, remove stale comments

Original prompt

Implement the plan outlined in docs/implementation-plan.md

Created from Copilot CLI via the copilot delegate command.

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