fix(progress): correct percentage display and add format-aware progress

Fix two bugs in progress display across book detail, progress page, reader,
and sync modal templates:

1. Percentage was stored as 0.0-1.0 fraction but displayed as-if 0-100
   (showing 0.5% instead of 50%). Multiply by 100 at the data source in
   both GetAllProgress and GetAllProgressData handlers, and in the reader
   route's ReadingProgress construction.

2. Progress bar width was never evaluated — { expr } inside style=".."
   was rendered as literal text by templ, resulting in 0% width bars for
   all items. Fixed by using templ's style={ expr } attribute syntax
   which evaluates the Go expression (uses SanitizeStyleAttributeValues).

Also add format-aware progress display:
- Reader template: shows "45% · Page 89/196" for reflowable (estimated
  pages), "127/342" for comics/PDFs (actual pages)
- Progress page: shows "Page X of Y (est.)" for reflowable, "X / Y"
  for fixed layout
- Add FormatGroup and EstimatedPages to ProgressWithMedia struct
- Remove hardcoded totalPages=200 fallback in progress handler (now 0)
- Add fmt import to progress.templ for string formatting

templates/book_detail.templ

@@ -229,7 +229,7 @@ templ BookDetail(user User, book handlers.MediaDetail, errorMessage string) {
 							<div class="w-full rounded-full h-3" style="background-color: var(--bg-primary);">
 								<div
 									class="h-3 rounded-full transition-all"
-									style="width: { book.ReadingProgress.Percentage.Float64 }%; background-color: var(--accent);"
+									style={ fmt.Sprintf("width: %.1f%%; background-color: var(--accent);", book.ReadingProgress.Percentage.Float64 * 100) }
 								></div>
 							</div>
 						</div>
@@ -238,7 +238,7 @@ templ BookDetail(user User, book handlers.MediaDetail, errorMessage string) {
 							<div>
 								<p style="color: var(--text-secondary)">Progress</p>
 								<p class="text-2xl font-bold" style="color: var(--accent);">
-									{ fmt.Sprintf("%.1f", book.ReadingProgress.Percentage.Float64) }%
+									{ fmt.Sprintf("%.1f", book.ReadingProgress.Percentage.Float64 * 100) }%
 								</p>
 							</div>
 							if book.ReadingProgress.CurrentPage.Valid && book.ReadingProgress.TotalPages.Valid {