fix(changelog): switch to page-based pagination (Gitea ignores 'since')

Gitea's commits API ignores the 'since' query param entirely, so all
360 commits were fetched via multiple pages on every load.

Replace days-based approach with simple page pagination:
- Initial load: page 1, limit=50 per repo (2 requests, ~2s)
- Load more: appends page 2, 3, ... on demand
- No more while loop or date filtering
- Remove daysProgression / currentDays state
- Clean up summary text

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

changelog.njk

@@ -99,8 +99,6 @@ withSidebar: false
     {# Summary #}
     <div x-show="commits.length > 0" class="mt-6 text-center text-xs text-surface-600 dark:text-surface-400">
       <span x-text="commits.length + ' commits'"></span>
-      <span x-show="currentDays !== 'all'"> from the last <span x-text="currentDays"></span> days</span>
-      <span x-show="currentDays === 'all'"> (all time)</span>
     </div>
   </div>
 </div>
@@ -127,8 +125,8 @@ function changelogApp() {
     loadingMore: false,
     commits: [],
     categories: {},
-    currentDays: 30,
-    daysProgression: [30, 90, 180, 'all'],
+    currentPage: 1,
+    hasMore: false,
 
     tabs: [
       { key: 'all', label: 'All' },
@@ -156,67 +154,59 @@ function changelogApp() {
     },
 
     get canLoadMore() {
-      const idx = this.daysProgression.indexOf(this.currentDays);
-      return idx >= 0 && idx < this.daysProgression.length - 1;
+      return this.hasMore;
     },
 
     async init() {
-      await this.fetchChangelog(30);
+      await this.fetchChangelog(1);
     },
 
-    async fetchChangelog(days) {
+    async fetchChangelog(page) {
       try {
-        const since = days === 'all'
-          ? null
-          : new Date(Date.now() - days * 24 * 60 * 60 * 1000).toISOString();
+        const limit = 50;
+        const newCommits = [];
+        let anyHasMore = false;
 
-        const allCommits = [];
         await Promise.all(GITEA_REPOS.map(async (repo) => {
-          let page = 1;
-          const limit = 50;
-          while (true) {
-            let url = `${GITEA_URL}/api/v1/repos/${GITEA_ORG}/${repo}/commits?limit=${limit}&page=${page}`;
-            if (since) url += `&since=${since}`;
-            const r = await fetch(url);
-            if (!r.ok) break;
-            const commits = await r.json();
-            if (!Array.isArray(commits) || commits.length === 0) break;
-            const sinceDate = since ? new Date(since) : null;
-            let pastCutoff = false;
-            for (const c of commits) {
-              const lines = (c.commit?.message || '').split('\n');
-              const title = lines[0];
-              const body = lines.slice(1).join('\n').trim();
-              const date = c.created || c.commit?.author?.date;
-              if (sinceDate && new Date(date) < sinceDate) { pastCutoff = true; continue; }
-              allCommits.push({
-                sha: c.sha.slice(0, 7),
-                fullSha: c.sha,
-                title,
-                body: body || null,
-                url: c.html_url,
-                repoUrl: `${GITEA_URL}/${GITEA_ORG}/${repo}`,
-                repoName: repo,
-                date,
-                author: c.commit?.author?.name || '',
-                commitCategory: categorizeCommit(title),
-              });
-            }
-            if (commits.length < limit || pastCutoff) break;
-            page++;
+          const url = `${GITEA_URL}/api/v1/repos/${GITEA_ORG}/${repo}/commits?limit=${limit}&page=${page}`;
+          const r = await fetch(url);
+          if (!r.ok) return;
+          const commits = await r.json();
+          if (!Array.isArray(commits)) return;
+          if (commits.length >= limit) anyHasMore = true;
+          for (const c of commits) {
+            const lines = (c.commit?.message || '').split('\n');
+            const title = lines[0];
+            const body = lines.slice(1).join('\n').trim();
+            newCommits.push({
+              sha: c.sha.slice(0, 7),
+              fullSha: c.sha,
+              title,
+              body: body || null,
+              url: c.html_url,
+              repoUrl: `${GITEA_URL}/${GITEA_ORG}/${repo}`,
+              repoName: repo,
+              date: c.commit?.author?.date || c.created,
+              author: c.commit?.author?.name || '',
+              commitCategory: categorizeCommit(title),
+            });
           }
         }));
 
-        allCommits.sort((a, b) => new Date(b.date) - new Date(a.date));
+        const merged = page === 1
+          ? newCommits
+          : [...this.commits, ...newCommits];
+        merged.sort((a, b) => new Date(b.date) - new Date(a.date));
 
         const categories = {};
-        for (const c of allCommits) {
+        for (const c of merged) {
           categories[c.commitCategory] = (categories[c.commitCategory] || 0) + 1;
         }
 
-        this.commits = allCommits;
+        this.commits = merged;
         this.categories = categories;
-        this.currentDays = days;
+        this.currentPage = page;
+        this.hasMore = anyHasMore;
       } catch (err) {
         console.error('Changelog error:', err);
       } finally {
@@ -226,11 +216,8 @@ function changelogApp() {
     },
 
     async loadMore() {
-      const idx = this.daysProgression.indexOf(this.currentDays);
-      if (idx < 0 || idx >= this.daysProgression.length - 1) return;
-      const nextDays = this.daysProgression[idx + 1];
       this.loadingMore = true;
-      await this.fetchChangelog(nextDays);
+      await this.fetchChangelog(this.currentPage + 1);
     },
 
     filteredCommits() {