feat(bubble): apply full UX review — labels, inline percent, accent, snaps

Implements every recommendation from the UI/UX review of the two-bar
bubble: readability bump, faster glanceability, per-provider identity,
smarter resize curve, and a richer snap behavior set.

Readability + sizing:
- Default width 180 → 200, min 120 → 140 (Windows shell minimum legible
  status-text floor is 12 px; previous breakpoint produced 11 px text)
- Discrete breakpoint table replaces the linear bar_h = h/4 formula —
  140/200/280/360 widths map to (bar_h, font, row_gap) of
  (12,11,4)/(16,13,6)/(20,15,8)/(24,17,10)
- Aspect tapers 3:1 → 2.8:1 → 2.6:1 as width grows so bars stay
  proportionally chunky at large sizes
- Right-column width now derived from GetTextExtentPoint32W of
  "100% · 23h" against the real font instead of the bar_h * 6 heuristic

Glanceability:
- ring_color_for_percent rewritten as a 4-band cliff: orange < 60,
  amber 60-80, red 80-95, deep red ≥ 95 — gradient hid the 75 vs 85
  difference at narrow bar widths
- Percent moved inside the bar (right-aligned with auto-contrast picked
  from luminance of the underlying fill or track)
- Right column now shows only the countdown ("2h 14m"), not the
  combined "X% · 2h 14m" string. i18n::format_countdown is now pub so
  the bubble can request countdown-only; the panel still renders the
  combined string via format_window
- "5h" / "7d" muted labels added in a new left column
- Rows whose bar is ≥ 95 % get a 15 %-red blush behind the entire row;
  fill color also brightens via a slow triangle wave (TIMER_PULSE,
  80 ms, only armed when at least one bar is in the alarm band)

Per-provider identity:
- 4-px vertical accent stripe at the left edge — Claude orange
  (#D97757), Codex green (#10A37F) — disambiguates the two bubbles
  when both are enabled. Mirrored into the expanded panel so the
  identity carries across surfaces

Snap behavior:
- Corner snap: release within 32 px of a work-area corner slams the
  bubble into the corner with a 12-px inset
- Taskbar-adjacency: SHAppBarMessage(ABM_GETTASKBARPOS) supplies the
  taskbar rect/edge; bubble docks against the inner face with a
  4-px gap on the docked edge
- Peer-Y alignment: when a second bubble exists within ±8 px on Y
  at release time, the dragged bubble snaps to share its top edge
- WM_SETTINGCHANGE handler re-clamps bubbles into the new work area
  when taskbar moves / auto-hides / DPI changes

Color packing:
- Direct DIB writes use rgb_to_dib (B,G,R,X memory order) instead of
  into_colorref (R,G,B,X COLORREF order). Already corrected in the
  previous redesign for the bar fills, but the accent stripe and blush
  go through the same path now

src/app.rs

@@ -502,8 +502,15 @@ fn propagate_to_ui() {
         let entry = snap.snapshots.get(&id);
         let session_pct = entry.map(|s| s.windows.primary.utilization);
         let weekly_pct = entry.map(|s| s.windows.secondary.utilization);
-        let session_text = entry.map(|s| s.primary_text.clone()).unwrap_or_default();
-        let weekly_text = entry.map(|s| s.secondary_text.clone()).unwrap_or_default();
+        // The bubble paints the percent inline inside the bar fill, so it
+        // only needs the countdown string on the right. The panel still
+        // shows the combined "X% · Yh" string via `primary_text`.
+        let session_text = entry
+            .map(|s| i18n::format_countdown(s.windows.primary.resets_at, &snap.i18n_strings))
+            .unwrap_or_default();
+        let weekly_text = entry
+            .map(|s| i18n::format_countdown(s.windows.secondary.resets_at, &snap.i18n_strings))
+            .unwrap_or_default();
         bubble::update_data(
             hwnd.to_hwnd(),
             session_pct,

src/i18n/mod.rs

@@ -198,7 +198,9 @@ pub fn format_window(window: &crate::usage::Window, strings: &LocaleStrings) ->
     }
 }
 
-fn format_countdown(resets_at: Option<SystemTime>, strings: &LocaleStrings) -> String {
+/// Countdown only — used by the bubble, which renders the percent inside the
+/// bar fill and only needs the time-to-reset on the right.
+pub fn format_countdown(resets_at: Option<SystemTime>, strings: &LocaleStrings) -> String {
     let Some(reset) = resets_at else {
         return String::new();
     };

src/panel.rs

@@ -276,6 +276,23 @@ fn paint(hwnd: HWND, hdc: HDC) {
         FillRect(hdc, &rc, bg_brush);
         let _ = DeleteObject(bg_brush);
 
+        // 4-px accent stripe matching the bubble — same provider color so the
+        // identity carries across both surfaces.
+        let stripe_color = match data.model {
+            ProviderId::Claude => Color::from_hex("#D97757"),
+            ProviderId::ChatGpt => Color::from_hex("#10A37F"),
+        };
+        let stripe_w = scaled(4);
+        let stripe_rect = RECT {
+            left: 0,
+            top: 0,
+            right: stripe_w,
+            bottom: rc.bottom,
+        };
+        let stripe_brush = CreateSolidBrush(COLORREF(stripe_color.into_colorref()));
+        FillRect(hdc, &stripe_rect, stripe_brush);
+        let _ = DeleteObject(stripe_brush);
+
         // Header row: model label
         let header = match data.model {
             ProviderId::Claude => data.strings.claude_label.clone(),